Really engaging tower defence. At first, I felt super safe, but then I was overwhelmed by the amount of enemies on screen. I usually think that higher levels mean stronger but fewer enemies, which helps keep a nice pace in a game like this, imo.
I pretty much agree with everything Code Monkey Max says. Nice graphics and good idea, but there are some things that could improve the game. Also, another thing: the turrets not aligning to the grid were so frustrating.