(Josh)
Fun mechanic! I know the sound was pre-existing, but I think you picked good sounds and music and used them in the right ways to make the game feel juicy.
I liked that all the characters were dice, and I liked how I could see my health indicated by the face on my die. I wish there had also been some kind of health indicator on enemies to communicate how much health they had, because without that it just felt like I had to keep pumping dice at them until they died. I could see enemies were different die faces, but I couldn't figure out if there was any particular meaning to that, each enemy seemed capable of shooting the game's various weapons.
Also, not sure if I missed something, but it seemed, visually, like my dice bullets were always a d6 rolling 1-6, even when I had weapons that shot non-d6s or d6s that rolled specific numbers (at least that's how I interpreted the weapon graphics).
Movement felt quite smooth! A minor gripe is that it was easy to get shot multiple times because there was no grace period of invulnerability between hits, so getting caught in a flurry of bullets is pretty easy. That's possibly more a personal preference, though.
Oh, and I couldn't figure out much about how the score was determined because there was no indication of how my score increased throughout the game. A display that shows when doing something that scores points would have been helpful.
Great game, well done!