The game holds more promise than its 3-star rating appears to say. Seriously, it trains reflexes better than lots of the games in the App Store (and offers no bulls--- on its contents as well)! The only reason why people give it such bad ratings is because they can't open the app themselves, but that shouldn't be reason enough to reject this app. Give it a try! This app costs nothing anything anyways, so it shouldn't disappoint much.
And no, in case you're wondering, I'm not sponsored by or otherwise involved with the developer in any way. I'm just a happy user, that's all.