Thanks a lot. OK now I'm curious. What problem do you have with the controls? Is it because of the rotation which works as impulse instead of continuous force? I haven't known the Trials series. The controls are like another game which is Elasto Mania.
The physics are made with box2D obviously and for the terrain graphics I used PolygonSprite which is standard libGDX. I have not quite understood why the texture scaling works like it works, though. You can view the code under https://github.com/resclify/A_lovely_day (it's kinda messy). The terrain outline line is a dirty hack - a ShapeRenderer call.