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I don't understand why you came 63rd for graphics. The minimal style that you used was beautiful, particularly the star background. My wife won't shut up about "how elegant and beautiful that star background is". She keeps saying that "the effect was a revelation" to her.

I really liked this. It had some nice touches in terms of the actual feel of the game, plus the switching gravity effect worked really well. The lighting and music worked well too.

You might want to change the instructions to say "click" rather than "tap". I spent a fruitless few minutes wondering just how hard I had to nudge the materials to collect them before realising that I should use the mouse. That being said, I thought the graphics were beautiful. The star background was a welcome pleasant change from the usual pixels and dots.

With the exception of the issue with the tethering, it was a cracking little game.

I was initially confused because the relative positions of the keys on the instructions didn't match where they are on the keyboard. It's quite a brain twisting game and you have to be really quick to get all 3 clones. I like the consistent theme that runs through the game.

I played this on desktop, but it would make a great phone game. I like one button games. And when the spaceship slows down it drives faster than my wife - clearly she sees even more meteors on her journey (she approved this comment before anyone gives me a hard time).

It has a very nice look, but it's a bit small for my liking. I'm old - nearly old enough for bifocals!

I really liked this. I haven't seen 3d with the Thrust mechanic before and it worked really well. The only issue I had was the lighting - everything seemed a bit dark (I know, it's a cave). The aliens and their voices were excellent - they really don't want deliveries do they? I was half expecting to hear "get off my lawn!"


Finally, a game where I don't die in the first 10 seconds! It's clearly unfinished, and there's a lot going on, but the concept is neat. It would have been great if you'd had time to finish it. I like the graphics.

This was brutally difficult. I liked the graphics and the sticking to platforms mechanic, but I think the controls maybe need a little bit of tuning.

This game has a great sense of humour, yet it ratchets up the tension as each character snaps with a rescue ship a mere 3 days away!

This is one of the more finished games in this jam, and that's saying something given that many of the games are good. This is excellent. I do wish there was a full-screen option as things seemed a bit cramped, but it's nail-biting stuff. Excellent!

I think I found a way of putting it on autopilot. If you surround the inner earth with 50 point towers (the ones that shoot at the bottom of the toolbar) then you run out of money, but then you don't have to press anything or buy anything to survive as it provides enough coverage to shoot everything. I've been locked in a stalemate with the boss for ages now.

Great music and love the alien graphics.

Very atmospheric, but either I was being stupid (highly likely) or there weren't any checkpoints. I like the use of lighting and sound to create mood - very well done. Also, the game was not at all what I was expecting so it came as a pleasant surprise to play it.

I was a little confused by "Press the intro" but pressing "Enter" seemed to do the trick. I like the pixel art, but the mouse controls seemed a little floaty. Nice to see upgrades in a game too.

Reminded me of the trading aspects of Elite, without the real-time combat.

I think I can see where you are going with it and it has the potential to be something interesting. The graphics are very original.

Wow, that's ambitious.

That was difficult, but rather fun. I like the low poly models ... and the gravity!

The icons were a bit small for my old eyes and I couldn't really tell what was going on. I managed to lay some grey areas then populate them with other things. Overall, I think it needs a bit more feedback.

I certainly liked the look of it, including the computer's face. The background music was very good.

Crikey, my hand is tired after that. Very innovative.

Very nice. Like Super Crate Box for neat freaks. It certainly has that one more go factor - I died several times and kept just pressing P for another go.

I enjoyed that. Good premise, and I like the particle effects when the asteroids explode. The only problem that I had was that the text scrolling across the screen made it a little difficult to see what was going on, but otherwise it's a fun game. My wife enjoyed acting as my wingman, controlling the astronaut.

The character builder is cute. It would have been great if the character had an effect on gameplay.

I somehow managed to smash meteors into the planet, but alas no metal.

This is the most fun I've had inseminating for ages! Seriously though, this is a fun game (and I obviously need to get out more).

"Inertial dampers are offline."

Today I learned that I am totally screwed if I ever fall into space.

Excellent graphics and sounds.

Great chip tunes. I couldn't really figure out what to do. I found the red zone and the yellow zone but could never get it to the green one.

Very nice graphics. It would make the game a little easier if it was clearer what you should click on.

The puzzle matched the premise very well. A very solid game. The relaxing music didn't help to relieve the tension as the screen started to fade as I ran out of oxygen.

I like how you used the zero-gravity so that the cosmonaut could be facing in any direction. Good levels too ... even if I keep seeing the word "Crushed" a little too often for my liking!

Also, what an excellent, comprehensive dev log. I'm impressed.

Animal graphics and the alien's face by my daughter.

Damn, that's fun. I like it a lot.

It's quite polished, particularly the animations on the main character. The soundtrack kept the game moving along nicely.

(Edited 1 time)

I'm glad to say that it has been a fairly smooth transition, although some of my code has more than a hint of "let's try this Kotlin feature" as I'm still learning. I regularly use Java, C#, Python and JavaScript for my day job, so many of the ideas in it are familiar.

What I like about it is:

  • it's succinct, which is a refreshing change from Java's verbosity
  • it's expressive - some of it is reminiscent of LINQ
  • it has batteries included, as it can use any Java library
  • it doesn't enforce any particular programming paradigm - if all you want is a function then that's fine
  • it has new ideas that work well, such as its approach to delegation

If you want to learn it, start with the tutorials, browse the reference and definitely, definitely do the Kotlin koans (I've been doing these on my lunch breaks and they're very good).

Update: this is a very good overview of Kotlin (video + transcript)

(Edited 3 times)

Kotlin, Kotlin and Kotlin

Kotlin is excellent. Did I mention that? It has all of the benefits of Java such as the rich libraries, LibGDX, with none of the downsides. It's also incredibly succinct.


If I want to run something after a few seconds, I use a Timer class with a method after() that takes () -> Unit as its last parameter.

Here's the signature…

fun after(seconds: Float, run: () -> Unit)

That lets me call it with a lambda as follows…

timer.after(5f) {

For what it's worth, the implementation of after() is incredible short…

fun after(seconds: Float, run: () -> Unit) = q.add(Task(run, now + seconds))

Extension Methods

Another thing that works rather well is Kotlin's implementation of extension methods. C# also has extension methods, but Kotlin's go further. Let's say I want to run all the eligible tasks in the timer's update() method. I could write it all inline in the update() method, checking that the LibGDX BinaryHeap backing the timer isn't empty, peeking the head to see if it's eligible, popping it and invoking it if it is, but that would be rather verbose and would hide my intent.

Or I could do this…

var task = q.nextTask()
while (task != null) {
    task = q.nextTask()

Here, q.nextTask() is an extension method on BinaryHeap<Task> that returns null if there isn't an eligible task or the next eligible task if there is. It's implemented as a private method inside Timer, so it has access to its properties, including the all-important now property.

private fun BinaryHeap<Task>.nextTask(): Task? {
    if (size > 0) {
        val task = peek()
        if (task.value <= now) {
            return task
    return null

Extension Properties

Kotlin also has extension properties. I have an interface Transformable that has properties worldX and worldY. When I use objects that implement Transformable in the renderer, I want to know where they are in relation to its camera. To do that, I add a couple of extension properties on Transformable in the renderer, called cameraX and cameraY. The implementation of cameraX is shown below.

val Transformable.cameraX: Float
    get() = toCameraX(worldX)

That allows the renderer to do things like this…

batch.draw(image, t.cameraX, t.cameraY)


Also, Kotlin's implementation of delegation is something that I haven't seen before. In the following example, class Animal implements Transformable, but the implementation of Transformable is handled by t which by default is of type Transform. That means any call to a method or property on Animal that implements the Transformable interface is automatically delegated to t, without the need to delegate it yourself.

class Animal(x: Float, y: Float, t: Transformable = Transform()) : Transformable by t {

For example, in the following code, the property worldX is implemented by a Transform, without the need for me to write anything more.

var a = Animal(100f, 200f)
var x = a.worldX


I am not going to claim to be an expert at Kotlin. I only started using it when I began this project, and have been working my way through the Kotlin koans (found here) on my lunch breaks. But I am very pleased with what I've found so far and I think that I will use it instead of Java in circumstances where that's practical.

I'm trying to figure out the best way of getting Box2D to play well with Ashley. Fortunately there are existing examples, such as those found in Overlap2D, so I don't have to do too much thinking – just as well as I'm shattered! My daughter wanted to see in the New Year, not realizing just how exhausted my wife and I are having had to cater to her relatives.

Much of today - at least once I got up - was taken up with spending time with my wife and daughter, playing Yoshi's Woolly World on the Wii-U, and Avian Attorney and Shovel Knight on the PC. For what it's worth, Shovel Knight is my favourite as it has very precise controls and a great retro feel. I think I may be putting in more than a few hours.

Eventually, when everyone else had gone to bed and the house was quiet, I managed to squeeze in a couple of hours programming. I'm impressed with Kotlin's when expression and smart casts. By the way, createFixture() is a nested function. Nice.

when (shapedComponent.shape) {
is CircleShaped -> {
val circle = CircleShape().apply { radius = shapedComponent.shape.radius } createFixture(circle) circle.dispose() }
is BoxShaped -> { val polygon = PolygonShape().apply {
setAsBox(shapedComponent.shape.halfWidth, shapedComponent.shape.halfHeight)

Today's progress:

  • Added Box2D physics and implemented a PhysicsSystem. It still needs some work, but the rudiments are there.
  • Created a BodyComponent to represent Box2D bodies in Ashley.
  • Created a ShapedComponent, which can currently be either circle shaped or box shaped.
  • Learned about Kotlin's smart casts and when expression.