The title screen art is fantastic! Imagine how cool the game would look if everything was drawn in that style. I guess that’s a bit much to ask for in a 48 hour game though.
As for the gameplay itself, intriguing concept, but a bit too easy. I didn’t even really understand what was happening and mostly just kept spamming zombies, which did the job just fine. Also, is there a lose condition? I think with some fine-tuning, this could turn into a fun little game!