The game is very simple almost trivial, but it's also addictive in a way. I've spent 10 minutes trying to make perfect A grade. Maybe it could be made as multilevel game, easier at first... ... I see crazyscarygames.com logo, but the game is definitely not scary ...
Anyway, I think at least this is a nice way to get familiar with Hodag ...

Excellent idea. The game is very hard though. The good thing is that you never loose powers you bought once. You can get 'free money' if you click extra cache button in the top right corner. That helps a lot.

In respect to defense games genre, quite a good gameplay, nice idea and excellent graphics that I haven't seen in quite a while. Maybe the game should be a little bit harder. I had to switch to hard mode.