Played this with a cup of coffee this morning and had a blast burning the villages! The two levels are decently long enough to feel good and the 3d graphics are a beautiful splash of life. The autofire feature is perfect for mobile! This is a great base for a cool shoot'em up game you made here! Great Work!
One touch that you are totally capable of doing, is changing the health of from numbers to a slider like the super powershot or use sprites instead. I think this will really make your game pop more and give you a more polished look overall. Again this is merely a suggestion as the game looks fantastic already!