Move with the LMB (left mouse button). Clear the walls with space. This is a demo of using the mouse to move and a non-standard level-editor-ish thingy. Just roll with it.
This is a kind of a Super Meat Boy/Splatoon/Super Mario Sunshine crossover. THIS LAGS ON MY COMPUTER, SO IT MIGHT ON YOURS! This is caused by the clones caused by pressing space. This bypasses the 500 clone limit due to the usage of the stamp function to replace the clones once they hit the red, but there are many clones being created while you press space, which is a heavy load on the Flash player or something, I guess. Or my computer's graphics card isn't the best, which is certainly possible.