The game is nice but level 19 is absolutely impossible to complete due to poor level design. As is, it is impossible to beat the game without leaving stage and continuing from level 20.
I do consider the game "good" (a bit too challenging) however that particular "partial game breaking" feature must be assessed, since the dev simply never bothered to move the yellow paint block somewhere else.
This means 3 things:
1- Everyone with the "Lord of Rubber" medal probably cheated the game.
2- The dev didn't even play the game itself.
3- The dev does not care at all for the feedback, and deserves a roundhouse kick to the face for uploading an impossible game & medal.