Super, but
It's a great game, loved the idea !!
Just a few details (consider them for the sequel)
- Don't let fuel go down while "flying". Cos when you've unlocked all the units, it sometimes gets impossible to get back on the ground, meaning you explode in air just because you didn't manage to get on the ground
- Make the sounds a little bit more realistic (especially for the sound when the tank bumps on the ground)
- maybe add temporary weapons....?