I played only the first bunch of levels but I enjoyed it. Its a simple concept and I assume they continue to throw more "curve balls" (if you will) into the mix. A simple suggestion: make it easier to rate the game from within the game itself. A direct link to the App Store is key for ratings. Also, if you want to have in-app purchases, be transparent about pricing and show it in the app. Requiring me to sign into my account to even see the prices makes me reluctant to even try, and Im the type of person to make in-app purchases. I can only imagine how people who are more hesitant must feel. Good luck!