It's simple yet fun! It's difficult as heck though. I'm not a fan of tilt-based games, because I can't handle balancing well. I find myself ramming into the enemies all the time, or moving between top/bottom level too fast and ending up hitting an enemy. The 3D view also makes it harder to accurately shoot at stuff (or maybe I just suck at these sort of games...) I could only get to level 2 before being frustrated and giving up. Nevertheless, I think it's a nice little game!
I don't have an Apple device, so I can't play this; but I've always really liked this simple, clean polygonal look. I hope you get to blow up the tanks from SPECTRE later on in it.
