Nice! The zombies are very annoying but also predictable, making it a hybrid puzzle-action game. Actually some problems can be solved just by blocking the zombies in the right places, some just with dexterity, some with a bit of both.
I also noticed that friction is such that two zombies side to side are unable to walk toward the player character if it is in front of both, just in the middle. But it's not too much exploitable (only allows you to finish mowing quietly over a straight cardinal line in that direction).