Satisfying game loop! I like how the dice was incorporated to roll for the amount of new enemies. It left some unpredictability which was fun.
I do think the theme could have been better integrated. It felt more like a progression of stronger waves rather than the enemies undergoing a 'metamorphosis'. Especially since they're zombies, it could have been cool to see them mutate as a result of the dice too.
But other than that, it's a solid entry.