It is an alright game, but has various difficulty spikes that requires you to pay for a LOT of gems to effectively overcome the challenges. But the real reason the score is so low is the fact that in order to get more gems, they made it so you have to log into Google play. Problem now is that Google Play erased all data from my phone and I can't log into my old save game. So I just spent 21$ on gems I can't access.