So I would say this game is very enjoyable. However it lacks in connecting to GameCenter. Like many other games ie: Pocket Miner, if the gamer did not have proper Internet connection at the time where he or she made an achievement that was not sent to Game Center, when reopening the game the achievements would automatically updated. If not, at least the player can retry to get the achievement so that it would show in Game Centre
MrAccaChan about Mini Ninjas, v1.0.3