This is a great spin on the Survivors mechanics, I love all these music/beat based games for this jam theme.
The different cassettes are a really cool idea for spells, and the music for the whole thing fit so well together! My only feedback is that it would be nice if there was some kind of health pickups, though it's probably short enough that it doesn't need it right now. Honestly I just wanted more...
We're also big fans of choosing 1-of-3 things here, so we built a deckbuilder for our jam game. Would love to hear your feedback if you wanted to try ours too!