Was on wave 3 when the score glitched, sent me to the shop but didn't allow me to select any cards, set my money to 999 then got stuck in a transition on the next wave. Really novel idea, and I enjoyed playing it!
Yeah I think the way that happens is Dense (do extra damage) overkilling iterates the kill counter and does funky stuff. The game usually works fine but that in particular seems like an annoying edge case thing :( Glad you enjoyed it!