nice! it reminds me of some old Atari 800 game I played, can't really get the name popping up, but something with boxes in a factory I think. Enjoyed it ! :)

I think with a little tuning this could definitely be more fun, but it is a interesting mechanic. It seems it is suffering from a pacing issue right now more than anything. My best score was only 8. I like how there is danger in getting stomped by the gadget you are using to kill the zombies. That adds an interesting tension to getting rid of zombies in the middle.