Fairly good.
I'm probably gonna be the toughest reviewer you get but...
Anyway it was a good game, exiting to play. You know, everyone likes to be an indestructo tank now and again. The motions were really smooth and I liked the way the tank would bounce on it's wheels. The background was good as well, and so were the enemies, probably because of the textures.
But...
It did get old fast. While I'm sure it's just designed for numbing your mind, a little change of scenery for the background or the enemies would be nice, and a few more types of upgrades would be good too. Speaking of which, the exp and level up interludes are nice, but they're just a little to detailed for this kind of game. I got up to level 10 by simply randomly clicking them every time, and it seems like the whole game is playable without leveling up at all.
Anyway, once again it was still good, and it's fun to kill time with, but a little bit more variety is always good.
:D