Very cool game, I had a lot of fun playing this! I've never played Wii Tanks, so you're the original as far as my experience goes. Love the hand drawn art, the mechanics all worked smoothly, and the dynamic music was a nice touch. The introduction of different tank abilities was rolled out nicely, and the difficulty level is great (after several plays, level 19 is my best). The tanks' differing AI was also really well done. This game felt very polished -- it's very impressive work for only one month. Thanks also for sharing the background on its development.
Feedback-wise, the only thing I felt myself wanting was an indicator of which side of the tank is the front -- these controls are difficult to master (I've seen them in racing games as well), so it's easy to get turned around.
Awesome work!