The game is great (it is free), however you can not buy from the store anymore. The game is not longer supported by the Developers (that is why it is free), as they probably left the game as is. Still it is fun to play without store and if you stick with it (if you lost, learn from your mistakes and keep re-trying for each level).

Achievements don't work, bugs and unfinished game while steam allows them to rob players despite multiply reports of the scam. Hopefully whoever owns it sells it off.