A very fun game, reminded me of Nuclear Throne. I guess you've also seen their talk about game juice. I really enjoyed your game, it is very well done!
Still, here are some suggestions:
- Let the player switch guns using the mouse wheel. I spent some time trying to figure out how to use the rockets and until then didn't even know that I had multiple weapons
- Make the weabons smaller. They are pretty far away from the player for such little spaces. Also this leads to me being able to shoot through walls when I stand next to them
I had a blast playing, good job!