umm nilo, gem td is totally different, just because there are gems doesnt mean they are the same.
for example, the tower system is different, combining is different, the skill system, there are more strategies to it, and there is no mazing..... there are others but i wold rather play the game than talk about it
this game has a glitch to get all the badges, it needs to be fixed.
(lose the first fight and then pres the re-load button in game to start playing. everything will be saying undefined and you will jump around, fight a battle in the canyon to get the badges)