Level 20 actually have a secret easy way to be passed :D While I was trying for the 40th time to pass it, I accidentally felt on the point of the arrow changing gravity hahaha
I was so happy when I saw: "Learn level 1". I thought "Oh Yes! With all those SP it will take nothing to finish low classes with low prices!". Then I've opened a new class...
 "SHIFT 2"){kind=icon}
 "SUPERHOTline Miami Deluxe"){kind=icon}
 "Down is Up"){kind=icon}
 "Crystal Story II"){kind=icon}
 "Tentacle Wars. The Purple Menace"){kind=icon}