I'm also working on a penguin game
I've downloaded the game and played it for 2 minutes, than quit and probably won't play it again.
Why?
You display interstitials during gameplay, that's a big no-go!!! I was in the middle of a jump, when the ad showed up.
Watch this video, when and when not to implement interstitials.
It looks like you've spent a lot of time creating the game and it could be nice, fun game, but that bad ad's implementation turned me off completely.