Use arrows to move, left to go left, right to go right, up to jump. You cannot wall jump, however, there are surprises for you, like an impossible seeming level made possible. Also, no, you can't double jump. Gray makes you move up slower and down faster. There are 6 levels currently.
I thought platformers are cool, so I tried to make one, also, it is in progress, since I am making it in my free time, which I don't have often. Please note: When you jump and go sideways, jump then go sideways.