Hello, without wasting too much time, here's my feedback!
Graphics: Look pretty nice :)
Audio: Nice soundeffects! Maybe add some music :D
Gameplay: I like the concept and the game is fun to play, but instead of making an optional wall of text, just write "WASD-move, Z-shoot" on the screen at the beginning of the game.
I hope the feedback helped you, and it would be nice if you could check out our submission as well, thank you! :)