This was excellent! Love all the little touches, like how the camera starts rotating after a while during a wave. The visuals, audio and gameplay are all great. Couple of nit-picky things:
1. Not have to click "+" and "Grow" to open up the tree panel, just one click should be enough.
2. I'd like to see the range of my trees either when I hover on them or click on them, particularly after I've upgraded their range so I'd know how effective the upgrade was.