The price might turn some people away, perhaps you could offer a free version with less features. I can't comment on the app because I haven't bought it, but the concept looks interesting.

I don't quite understand... There is a free version:

https://play.google.com/store/apps/details?id=com.karolmajta.flipit

And a paid one:

https://play.google.com/store/apps/details?id=com.karolmajta.flipitpro

Oh. Sorry, I completely missed that.

This is definitely a good game with a nice, simple concept. I think you need more buttons (rather than just tapping) to get to different screens; primarily, moving on to the next puzzle (perhaps a button that appears when the puzzle is complete) and going back to the menu (I don't know how to do this as it is). The graphics are simple, characteristic of the game, and the levels definitely have a learning curve. Good job!