The movent in your game really feels great and dynamic, which is great. I also really like the visual changes on the gun model when picking up powerups, as well as the overall graphics.
The only negative thing I could say is that I accidentally lost my progress because I thought there was a pause menu on escape (should have read the game's description a bit more), so maybe that would be something you could add. And I feel like the rotation of the gun is a bit odd. Maybe rotate it a bit and move it slightly to the right
That's just a minor issue though and your game really is quite fun, so good job!