ah the "press e" was for buying new paddles from Hermes, when you get close to one of the paddles a bunch of coin slots appear and if you press e you can buy it, if you don't buy one the next level is probably too hard, i'd recommend the green one as that is slower but reduces the sliding. The red one = fast but more sliding, the top path in the subsequent level can only be passed with the red paddle. But you got through the game with just the blue paddle? That's amazing! xD