Love the sound design, although personally for my game preference I find it it a bit slow yet hard which I find very unsatisfying and kinda kills the games mood (which might be just me so ignore this). With a bit more game juice it would be a killer game (bigger bullets, screen shake, etc...) as repetitive games like this one use game juice to satisfy the player, make him feel powerful and keep the player hooked (granted game juice is hard to do in a game jam but noted just as a fyi). All this aside, for a game jam game, very nice!