Device: Nexus 7.
Good news: The game is not broken. I'm able to through the levels.
Bad news: I think it tries to show me some ads at the end of each level. Which results in the game crashing at the end of every level.
Well it shouldn't be showing any interstitial adverts. All the ads are banners shown in the main menu.
What you're probably seeing is scoreloop asking you to log in. Were you connected to WiFi when these crashes happened?
Try pressing the scoreloop logo on the main menu (while connected to the net) which should show you the login dialogue without crashing. Once you actively accept or decline login, it shouldn't bug you again between levels.
I'm gonna try and improve the scoreloop integration for the next version.
Just to clarify. Is your progress saving before the crash, so that you are able to continue after re-launching?