The game is great, really, but it suffers from some awful issues, such as randomly losing progress made. I logged in today to find out I lost a key and lots of progress on multiple levels, meaning I had to recomplete a few. The account system never works, so dont bother with it. Plus, the dev has basically abandoned the game. There hasn't been a new update in almost 4 years now. It's fun, but need some patching.