Love your game, here mine https://itch.io/jam/brackeys-6/rate/1177169
I don't think I've run into a game like yours in quit e some time. I really enjoyed the minimalistic visuals and the difficulty curve. Overall its a great game.
My only complaints are - It doesn't feel that juicy when killing the zombies, adding a couple of particles could really spice it up.
Never the less. Well done. The game its self is fun and the replay value is great! Congrats! :)