(Josh)
Great concept! I loved having randomized bullets with different effects.
Some of the effects were obvious, but there were a few that I never really figured out through gameplay. It would be helpful to have some text somewhere to explain what each bullet does (like in the inventory, maybe). I also wasn't sure what the final boss' gimmick was. I saw it rotating through various effects, but hitting them with a bullet of that effect didn't seem to do anything. I wound up just pumping bullets into them and occasionally seeing the health bar go down. (The AI were also not too hard to deal with, which is understandable in a jam game.)
The title screen/intro gave me a laugh or two.
Overall, great job!