Hey thanks for making this!
Tried it before work, but haven't finished it yet. Simple but can be difficult.
My only suggestion is that the way the starting zone is shaped i thought that I was defending the warehouse (BTW its
warehouse not
where house ) and needlessly waited for a wave to arive, instead of following the path like i was suposed to. Ether add a line of text to follow the path, or draw an arrow in the ground or something to make it more clear.