This wants your money!
I enjoy all tower defence games and have played many, this one starts the same as all, little tutorial each round which is fine, hence the reason for the second star. The big issue with this game and thankfully you find out very early, it is impossible to progress without spending money, from the 5th level, it will take multiple times to defeat the round. There is simply no way to then earn what you need to progress for example completing earlier rounds for the gems and coins. The only other good thing is the gems appear to be reasonably priced and if you are willing to pay then you will get good value for money. So very simply, you need to pay to play this game! Fun TD but wants money too early in game for me