Very well made game. You know your stuff! Really liked how you teach the mechanics through gameplay. I'd love to see a full game made out of this!

Lovely use of the theme :) ! And great level design. I found it a bit hard to change the jelly's direction. Often I would just jump instead... but other than that very solid entry.
And big thanks for your awesome feedback on Life is Snot :) 

Awesome game! I can tell when somebody does their game design homework :). I appreciated being taught concepts in a straightforward and clear manner. As other comments have mentioned, the only one that felt out of place was the spider. Here's what I think of that:

1) I think the first time I encountered one, I avoided it by jumping. Thus, I didn't learn anything meaningful during my first encounter with it, I just considered it a random enemy with a linear movement. I think it would've been much better to run into a spider in a constrained space in which jumping was not allowed (like a tunnel or something). That way, it'd be clear that I can run through it. You could then follow this puzzle with a long lifting platform that had one spider patrolling it. The player would have no reason to jump, so would very likely chill there until the spider killed them. This generally would be crappy because the player would die because of an untaught mechanic, but in your game, death is not really a huge punishment since you respawn in the last platform you touched, so I think this would actually work. The alternative to this is making it obvious that spiders can pierce a shield (maybe by giving them huge fangs), but then it wouldn't be clear why they don't kill you when running. Perhaps you should also reconsider the enemy being a spider at all, and look for something that made more sense visually for this mechanic.

2) The second encounter was the puzzle with the bullets and the spider was next, and when I accidentally hit the spider and wasn't killed, I was very surprised (I even thought it was a bug). Then I figured out they only kill you when on shield, but even so, there was no clear hint/feedback as of why this was happening. There's a small animation in which the shield slowly pops, but it's not very clear why. Again, the best thing may be to remove the spider for something more intuitive.

I hope these comments make sense to you, and let me know what you think. Also, I'd love to have your feedback in my game. For the real challenge, try clearing every level by shooting only once!

I enjoyed playing your game and learned lots of game design. Thanks!

Very good execution of a one button platformer. Most likely the best I played so far.

Only the collision with tiny spiders is sometimes hard to understand. I had situations where I survived whereas I hit them. From what I tested, the shield doesn't protect from them, so... I'm not sure.

Apart from that: "bon travail" !  

(graphics can't be rated but they're cuuute)

That's...awesome! It's the best use a single button I saw, the level design is awesome all always surprising with new mecanics, didn't knew we could do so much with only one input! Awesome!

I played your previous games. You must have a great passion on the platform game. Me too. Its perfect on the graphics and match with the theme. Your game reminds me of my many childhood games as well. Very great on the animation and the level design~

I love it! I love the wacky and innovative control scheme, and also the colour scheme! Great work! I also love the sounds :P It's amazing how much you managed to accomplish with only one button! This is really impressive, good job! :D

I would also really appreciate it if you checked out my entry, Sheepherd Dog :) Thanks in advance!

Very fun and well thought. Also the graphics and sound effects are impressive if you made them on your own

Great game! The one control scheme is feels tight enough (except for tap & double tap) to feel great when you start to get it. Clever ideas introduced in each level, with  a lot of care to the sound and some small details. Absolutely love it !

Very cool game, perfect use of the theme and cool design ! Well done :) Just some struggeling with the tap sometimes but nothing terrible.

Nice use of the theme! The one button control works surprisingly well, i had just struggle with tap & double tap some times. But overall it's a very nice platformer and a great entry for the jam!

Really smart use of the one button idea. Other than the turn around bit, the controls don't depend on your current state, so instead of watching what state you're in, you can use the exact same controls each time and that starts to have a skill feeling. The only issue I had was getting the timing down on the quick hold and then tap for a long jump from standing still vs accidentally just turning around - might be something to play with around that. This really makes you think about your controls in a new way!

I love it! Definitely in my top 10. The way you introduce new elements and how it all ties toghether feels awesome. It had a lot of content for a jam scope. Music was awesome too, everything made me feel like I was playing an old-school game, it was really challenging but relaxing at the same time. Would love to see the concept applied on a mobile game, feels like it would be a good fit for it!

I love this idea and most of the implementation. The problem is that the game lags so much. I feel like that might be why it's impossible for me to turn around.

Awesome game, overall I enjoyed it, the look and feel is great, but it felt a bit frustrating when I wanted to turn around, but the slime jumped instead.

So lovely!!!! I loved the art and the game feel of your game! It feels polished and has a lot of small details that brings player attention and engagement like the level complete heart animation. Its easy to learn/hard to master (excellent). The way you worked with the mechanics using only one input worked very well! Its very responsive and really easy to get going! I added to my cool games collection :D its definitively a good game reference. 

This is perfect for the Only one theme, one of the best, very smart use of only one versatile button, the level design is great, too. An d also thanks for the check points :D

I like that you had to stop moving to use your shield. I think it would be better if you could only press space to move the player in one direction and use other mechanics to let it do different things. (For example enabling the shield when you are not running.) Because right now it's often hard to to use the spacebar for multiple things.

Design[4/5] Shielding mechanic was great, but using spacebar for moving, turning and jumping is a hassle at times. It was also unclear from the beginning that you needed to keep running through the enemies to pass them.

Theme[5/5] Only one button.

Originality[3/5] There exist a lot of one button games. Would give more if you used the environment more to jump/switch direction.

Great stuff! You really got everything you could out of that mechanic! 

I thought the sliding enemies were fine because there was an example above though I did die a few times :D