Not a bad little game. Somehow I dont think I've ever played a 3D tower defence game and having this in 2D might have been easier to do. I like your mechanics and the different kinds of towers I could build. It seemed to be quite touch in the beginning but after a short while I think I managed to get towers up on all the little nodes around the picnic table and that general area. You've definitely got the basis of a tower defence game here. Keep going with it!