Thank you for the feedback!
I just made a real quick update to fix the control issue. Now one push = one turn, and you can switch back to the former mode to dash through empty levels.
The full-screen bug is probably because of the up-scaling. I noticed that yesterday but i didn't had time to look for a fix.
I also need to provide a better explanation of the mechanics. I was indeed afraid that people don't notice the terrain type :D