I really liked the music! The main song is real banger! I wish I could make music like that! Thank you for noting that you took the song from pixabay.com - such an interesting resource I didn't know before. I hope I can incorporate some music from there in my own games in the future! I also liked the game's sound design.

The art is clean and concise, with good readabilty. 

I liked the idea of leveling up. The moon functions like the bible in Vampire Survivor, which I like. I wished I could make the moon more overpowered, though. It felt like I didn't get much use out of it in the beginning of the game. And I wished I could make it more powerful a lot quicker, but maybe that would destroy the game's balance. 

It is a clicker game, which I imagine can be exhilarating and is a core part of this game's getting-better-by-aiming-better-and-clicking-faster mechanism. 
But I wished it was not one shot per one mouse click on the incoming "germs", but rather, a barrage or stream of bullets through holding down one key or mouse button. I am not good with clicker games and clicking so often in such a high frequency made me feel slow, inadequate and a bit frustrated with my slowness and slight feeling of exhaustion in my clicking finger.
My preference would be: Aim with mouse, hold down a button to fire a stream of bullets. That way, you can level the shooting as well, e.g. more bullets in a shorter timeframe, faster bullets, spreading bullets, stronger bullets, homing bullets, maybe left click = many weaker bullets, right click = single mighty bullet with AOE and cool down. This would be my personal preference. 

Also, I would like more "helpers" in addition to the moon. Maybe spawn space ships which fly around the planet and shoot down germs on their own. The space ships could also be leveled up. I want to have the feeling of: "Hah, you fools! Come at me all you want! My mighty space army will shoot you down in an instance! You shall not pass! You don't stand a chance!", or something along those lines.
Managing and balancing 
a) feeling powerful,
b) aquiring more power and feeling satisfied to do so,
c) the feeling of being challenged and therefore
d) making the feeling of success and victory possible
is difficult, but I think if games can strike this balance, they will be very fun to play.

Also, give the option to evolve the moon into some kind of Death Star, which shoots germs down on its own within a certain radius. 

Given that I started imagining the game's progression while playing it, shows that this game provides a solid base to be build upon and expanded. Good job, developer :)

I hope it was okay for me to list my ideas for the game. Personally, I learned a great deal by reading the comments of people who have played my game - which suprised me alot! -, so I wanted to pass on this favor. I hope I do not come across as someone mean, who just lists of odd things just to construct a criticism. Playing the game, I had the impression that it was made by an experienced game developer, so rather than only listing superficial words of encouragement I wanted to list things I wished were in the game, to inspire for improvement and expansion.

Solid game! It was pretty fun! I like how you have to play around your moon, utilising it's strengths

I got to wave 12 and then accidentally clicked out of the game screen and onto a bookmark, losing my progress. 👻

The game is pretty fun but having the upgrades be limited to the moon feels constraining. Most waves the moon wasn't relevant as I was able to blast the viruses before they reached the planet. And when a virus does reach the planet the moon will hit them, at most, once which isn't super useful. I opted to put almost all the points into moon speed with a few into size and one into power. I could have made it much more powerful but it would never have hit anything, and I suppose making it much better instead of much faster might have been more useful but, as said earlier, the laser is still going to do most of the work.

Wow this was great, I only survived 10 waves. How long is this? 

Nice game. love the music and the graphics are great. A bit more variety with enemies would be good but other than that this is a lot of fun and a great entry to the jam

Great Game, good visuals and nice mechanics. 👌👌👌

Wow, just wow. I’m not exaggerating when I say this is probably the game I’ve enjoyed the most so far out of all the ones I’ve tried from the jam. It’s super addictive, the design and art are amazing, and the music is an absolute banger that gives the whole thing a unique epic atmosphere! I loved it, I really hope more people get to see your game, it’s a hidden gem :D

I really liked the visuals and the music!

Very simple, entertaining, challenging ! Good job it fits the jam 

This is another fun game to play.

Pretty fun game but I am a sucker for these types of Flash games. One issue is that the moon wasn't really helpful, I bought all the upgrades and was killing every little thing myself anyways. Click upgrades would have been cool. Also got tired of spam clicking around level 11 but it was fun! Saved the world!

Nice music great play through could maybe have more variety in the enemies movement like some faster ones plus the heavy ones, but had me clicking like a mad man and now my finger is sore :D

I loved this so much!! It reminds me of an old flash game in the best possible way, plus the art and concept made it feel super fresh