Good game but i feel like the controls need improvement. 

It's a very nice game, plays smoothly and it's a fun concept/theme, but even if you shoot prime numbers, you shouldn't need to literally press them. As an exmaple:
The game is in portrait mode which immediately reminds me of a mobile game, right? But on a mobile you yould tap on buttons that are most likely next to eachother. The same applies to PC, you can just use one finger and press one at a time, but if you are used to a keyboard you won't do that and 2, 3, 5 and 7 feels unnatural and also a bit uncomfortable. 

This is a just a suggestion of course, and it's based on personal preference, but please consider giving it a try using for example the hotkeys 1234 or qwer as input keys.

Cheers, i hope this helps :)

Very Good Game with Prime Numbers.

Nice art and visual Feedback from where Enemies might be coming from.

It would be great if bosses were a bit slow, depending on the number they have. And also, this will be much more fun in Landscape mode too :)

Overall, it was a cool Game.

I loved this game!

Wow this is an awesome game! I'm a math teacher so I might be a bit biased, but this was one of my favorites played in the jam. I loved thinking about the series of factors that would destroy the big numbers and when I got a really nice 3 to 4 factor combo off in a row it felt so satisfying. The music track was perfect for the atmosphere and intensity of the gameplay and visuals were lovely. I liked how each prime had its unique color glow.

Fantastic game!

Great concept! The music was great and so were the visuals. Nicely done :D

Oh no, a math game! Actually not too hard, math-wise, although I had to think to figure out the prime factors for the larger numbers. (It's been a while since I was in school!) Simple mechanic with a nice twist that kept it fun, music was on point, I loved the little wagging jet trails behind the enemies. Very cool, great one-guy game.

I found the game a bit difficult, especially the bosses—they made my fingers like this, lol. Maybe slowing them down a bit could improve the experience.

Other than that, I liked the sound, music, and aesthetics of the game, and it was fun to play. I wanted to keep playing to get better, but I couldn't get very far. Good game overall!

I love the concept, but I suck at math so I didn't get very far. The music is awesome, the visuals are very nice as well.

Fun little game, and I got the concept quickly. Would be great to inject a bit of narrative into it. Good job!

I don't think I can do much better than that, math is hard! :D

Very slick presentation! What was your inspiration for making a prime number based space shooter?

Love the music!! Creative math idea, once I experienced the first boss I finally understood what the core game concept really was, and I like it!

Very nicely done! :)

This was a nice surprise! Cool gameloop, cool music, it's a good game, well done mate!

Oh boi I didn't expect to do math I just want to play!

That boss caught me off guardxd

Pretty fun maths game and the music was a jam. Got to 13800 score.

The sound really fits the game, but I missed the volume keys. The sound is too loud. Did you use "Audio mixer" in Unity? My first game jam had the same issue :-P.

The changing bullet controls are weird. I would expect 1 till 4. As mentioned below, even 1 key to toggle between the bullets would be even better. It would help if you can see which bullet is firering in the UI ;-)

nice game 

but controls to change color/wep could be better.

if i could put one finger over one key would be best.

Interesting game mechanic. I got destroyed by 42, can't say that about most games. Music fit well