Use A and D to move. Press space bar to jump. Dodge the falling spikes and try not to fall into the spike trap!
This is the original Simple Gravity Engine, the one for remixing (for your own needs for different kinds of games, but not a remix of this specific one) is the copy. This game has a lot running at the same time, so please don't complain to me about the movement being slow. I'm trying to find out a fix for it, and may have to double it.