Press and hold any key to move up, release to move down. Avoid the obstacles.
This is a remix; a lot of the credit goes to THE_GONE_LAKE The changes I made: Added score feature, music, and increased difficulty as the game progresses. I also added a "Start" feature and increased the amount of keys which can be pressed to make the player jump. Lastly, you now lose if the player touches the bottom of the screen.