Hello, how wide is your screen?
The game screen adjust to cover all the screen available without any deformation, the optimal screen ratio is 16:9 (for example 1280x720), I tested with more wider ratios without issues but due to the way the infinite scroll is programed it flickers on very widescreen configurations (like 2 or 3 screen setups).
If you give me some feedback on how wide your screen is I can look up for a solution (maybe I could add black bars on the side of the very wide screens...).
I'm checking and it's wide but it's not wider enough to cause problems with the infinite scroll, for the scroll to break it requires a screen ratio of almost as wide as 3:1, I'm testing here and it should work fine with your screen size.
Maybe it's related to other thing like the graphic card not being able to refresh a big screen on the required rate on the canvas object, you can try lowering the resolution and checking if that solves it, are you playing on the Ouya (or other android device) or in Windows or Linux?