move your mouse pointer for direction W, up arrow, click the stage or press Z to move. you are the blue one (easy) the enemy is the green one (normal)
the grey thing has collision if you perform a series manoeuvres on the grey thing, you can clip through it. (i intended that) CRASH TRIGGER! don't touch normal. or else the web page will crash. tip 4 you: DON'T USE CRASH TRIGGER! D: NORMAL CAN GO THROUGH WALLS!