Pyk Pyk is puzzle game, very simple to learn and very rewarding to complete. The graphics are quite good and the idea behind it is to put your monsters on the stars that are located in every level, your monsters are a bit clumsy when they move, so you have to use the boxes that exist around the level to ensure they stop moving in the right positions. The game is pretty funny and an excellent time killer.
It can be downloaded for free from Google Play.
Also have a look to the official webpage.