use the arrow keys to move, try to collect as many gold coins as possible while avowing the red obstacles. you can jump on the red circles to kill them, you can all so double jump. the goal is to get from the blue square you start at to the one at the end of the level.
GOOD LUCK!
some notes: level 11 is a bonus level, level 10 is technically the end of the game where you halve to get to the orange gem before the time runs out.