Looks great, sounds great, and plays great. The balancing could use some tuning though. The game got a lot less interesting when i realized i could progress by just spamming the mouse buttons on the hearts and stay around full health forever.
I also don't think the dice upgrades were very exciting. Unocking the sniper is cool, but it's kind of unclear why you'd want the others. I'm assuming they increase the probability of getting that type, but it's kind of underwhelming compared to the much more tangible effect of bigger bullets or more ammo and health especially when all the types are useful.
Considdering it's a Jam game, it's seriously impressive when those are the only issues.