Amazing game, that is both really beautiful and with a lot of different things to see!
However, the cost system is unclear, and the missiles coupled with extra guns are clearly the best option 100% of the time.
The art is minimalist, but stunningly beautiful, with a lot of colourful varied and readable bullet patterns. Bonus points for having the bullet be in negative when overlapping for clarity and aesthetics, but the exploding bullets would have benefited from a different shape to prepare the player.
The main menu is a bit overlapping, there is no sound, and it's a shame there is no player damage / lose condition... but it's a jam, so it's to be expected with the massive work you've put everywhere else.
An overall great idea that could be really interesting to develop, and an amazing jam entry!