I really like the visuals in this game --- the particle effects are especially nice! The game is a ncie fit to the theme too, but it takes a little while before I felt that was true.
The first few rounds were too slow for my liking. It was hard to find the enemies and they didn't seem to seek me out very well. So I spent a lot of time running around. This was fixed in the later rounds when there were a lot more enemies.
The upgrades started to stack up and really gave me a nice feeling of being out of control. The pushback made it hard to move forwards and the rubbery barrel was a hilarious touch (and a cool visual effect!).
The enemy scaling themselves felt a bit off. Once I met the green enemies the game became much harder as they took a long time to kill and did so much damage so fast! But otherwise I thought the enemies were well designed.
Overall the game was intuitive, well built, and felt great to play. I spotted a couple other small issues like my camera clipping into some of the meshes, but nothing unexpected for a 48 hour game. Really great work!