You're really on to something here.
Original game-play style, with a difficult fun-factor in how you control your tank. This game was great, I had a lot of fun playing it.
If you decide to make a v2.0, here's my suggestions
-Upgrades that effect the tank, not just the enemies. (Higher bouncing, faster left/right control, maybe even a limited amount jump ability?)
-Unique sounds for getting hit by each weapon. (One single explosion sound got slightly mundane.)
-Different backdrops for different levels.
Just some ideas that could spice it up. Good work!
~VW