Warp Zoned writes:
"Nano Ninjas is a tower defense game for iOS devices from indie developer Bad Chunk. It sets angry robots who look like samurais and ninjas against actual ninjas. It’s built very similarly to Plants vs. Zombies, giving you the main adventure as well as some smaller minigames that unlock as you play the game. Your ninjas unlock as you go level to level as well, with the robots also increasing in difficulty. While it seems like a simple enough formula, does copying something popular make it work?"