Hey Freaky Soft,
I just checked out your game, and it looks great; congratulations! I noticed that you have in-app products that you allow your users to purchase as a way to monetize your app. I was wondering if you ever considered an offer wall or in-app surveys as a way for your users to earn points that can be used for your in-app products or even game/level upgrades. One of the best features about this is that while your users are completing offers and earning points, you are earning revenue for each offer completed. Let me know if you would like to talk about this in more detail. I would love to get you setup with us! You can PM me here or add me on Skype at ilyssa.adscend.
Thanks,
Ilyssa Cohen | Adscend Media