Arrow keys to move. Up to jump. Seems like a normal game at first, until you press 1 and 2 at the same time. This brings you to a blank screen, press d to start drawing and move you cursor around, you can stand on these and use them as platforms. Press U to stop drawing, and space to delete all the lines you made.
Press 5 and 6 at the same time, and you are in a block builder mode. Press to place blocks, B to change blocks, and space to delete. If you press c for customize you can move the slider to change the design of the coins. Press v to get rid of the slider. Press P for problem solving, it makes it where you can drag the character to get out of walls and press O to return to the normal game.