Press space to go through the into and arrow keys to move. Sorry that it isn't better, I will make a new impossible game to make up for that. With side-scrolling too!
Just to note, the circle is the one who got sick and he is the guy from Ultimate platformer and he got sick from the boss in that game(the boss was lava). Due to a coding part of the game, you can just keep on holding the right arrow key to flip through the into. Level 6 is personally my favorite, but 7 is pretty cool too.