Really awesome visual and juicy polish! I'm a fan of roguelike-ish genre so seeing one made for a game jam brings a smile to my face :D
Here's my feedback. The joystick seems to not work at all, the shoot button works though but not the movement. The screen shake gets too aggressive when there's a lot of things happening, could maybe tone it down as it kinda hurts to see the screen when it happens lol. Then if I'm the spectator of the game, it wouldn't be obvious to me which is the player and which is the enemy at first glance, having a visual distinction between them like having the enemy on different color would immediately improve that. Especially on an arcade machine scenario where there would potentially be spectators watching someone plays.
Overall, really love the polish you made for the game. Lots of variety to choose from when playing and a really nice take on the theme. Great work!