Oh, thank you very much for the detailed feedback and suggestions!! Hehehehe, indeed, there´s a info signal in the second level that tells the player he can use the walls to make another jump in the opposite direction after total collision. But you are right, I forgot to put this signal before the quantum data orb… There are two ways to reach the portal in the second level, maybe is the reeason that the info panel is situated after the orb…
Your ideas are very interesting. Maybe could work also a camera movement before starting the level in a superposed state (black+white); but, for this prototype, the better trick is to use the peripherical vision while playing to calculate and remember the position of walls and platforms in every change.