I like this game a lot. It's very feature rich, and it's impressive how much you got done in 3 days. Waves, towers, upgrades, and the whole nine yards. Usually you'd expect bugs with something this packed, but I had None!.
I guess I was a bit confused with the move spot mechanics. If we can move the spots, maybe it's easier to be able to build anywhere? Just a minor thought.
Really great job.