This is technecly my first 90% coded by me platformer! Arrow keys to move. Face left when you press the Stop sign, if you want to play normally. I realize it is full of glitches. If I could, I would add Goombas and Phriana Plants instead of spikes, but I don't know how to make that work. There is a Goomba animation inside, though.
I added a backround and more ground and art. Thank you @griffpatch for the scrolling backround tutorial.