I decided to add some things (hopefully it’s already judged otherwise this is even less minimal >.< then again they could be judging on aesthetics instead of theme):

-Wall tiles

-Minor scenery outside the house

-Tweaks to upgrade speeds

-Grenade timer tweaked

-New enemy! The Bloat has perfect pathfinding and will never get stuck. However he is slow because he carries inside of him a load of 5 more zombies! :O

-Tutorial added + Guide that tells you about what an upgrade will do

-Some extra design changes that make sure no one gets behind the house (that’s really off the map anyway)

-New thumbnail to reflect changes

-View system changed - this is huge in terms of the way you feel gameplay. I love it on my monitor because it leaves trails due to the black background. If you don’t like it though you can switch back to the old one with the middle mouse button.

-And a little while after these updates I made another quick one to add the score counter to the HUD.