Hi, and thanks for the feedback. the technique for the terrain is quite simple but I'm thinking of making a guide soon.
It's a set of sprites appearing randomly "on the top of the road" at an interval, moving to bottom while getting more opacity and growing up until they reach a Y value(then they're destroyed).
The explanation of the game was included in the google play store description but I'll certainly put a "How to play" link on the title screen.
The game is 30 levels long. (130000 points to reach the end). It's hard but doable
I'll add soon other "enemies" (which are more environmental problems due to the planet which is collapsing) such as electricity arcs coming from the ground.