Nice game, I like the idea. It's a nice base where you can build on. It's a bit easy at the moment I was at wave 8 and let it ran while doing some chores and came back at wave 18 still alive ^^
Very nice work for a jam game!
Update I left it playing over dinner I'm at wave 46, but it gets a bit laggy on my old pc with rendering all the black spots XD
So if you will continue working on it, there is room to balance it better ;)