Originally Posted by gallandof
crystal defenders is fun, but doesnt have the replayability of some others out there
I enjoy Crystal Defenders a lot too, that game is HARD though.
Fieldrunners and Plants v. Zombies are both available on the Amazon Android Appstore. Guns'n'Glory was also a good one, though a little difficult. Other than that, I also really enjoyed TapDefense, but its lifespan was too short because once you get the flamethrower tower, nobody can get through. Nobody.
I also recommend Medieval Castle Defense, it's another hard one though.