Controls are easy, and the levels start easy and get harder, but super fun. I also enjoy the music as it is very relaxing. I think it would be worth the price IF there were more than 32 levels. That's it.. 32 levels.. looks like I will finish the entire game in 25 mins or less. Why wouldn't the developer make it at least double that( 64 levels) before releasing the game for $1.99?? Please make more levels very soon, because it is a super fun game, just not worth 1.99 for 32 short levels.
I'm surprised that this game manages to be pretty tricky despite its incredibly simple premise and controls. The puzzles are well-crafted and always make perfect sense once you figure them out.