[GAME][FREE] Crystal RIddle - logic puzzle topic

Hey, guys!
I hope you all enjoy my game, released today.
Here is the link to the game: play.google.com/store/apps/details?id=com.electricfoal.crystalriddle&hl=en
It has simple mechanics, but can train your brain very well.
It was made with andengine, so I can answer some questions, if you have :)