Very addictive, I loved it. Required walkthrough for 6 of the levels, couldn't get a star in them otherwise. Didn't need any skips which was nice, with persistance any level can be beaten, even if not within the star limit. I created a level called checkerboard, asked for it to be submitted, posted it on gapmonsters tumblr, hopefully I'll get a response.
Definately a keeper, enjoy guys!