I really do like the take on the roguelike cards, the projectile fireworks, and the poker style deal.
I’m not really worried about the sound so much since it’s not directly part of the game so I think you should be credited for not turning this into a 24 hour project for that.
I didn’t see any bugs either.
Easy suggestion: being able to pick 1 of the heroes to take to the next wave.
Less easy suggestion: Total damage minus taken damage high scores.
Harder suggestion: Deck editor!