Well I used a old base for a game and made a little game.
I'm not used to JavaScript (in the actual contest im going to write something in Java ^^)
But well 1h ,packing things together and writing some code...

SPACE - Turn off music (If the music starts working lol)
LEFT - Go left
RIGHT - Go right
DOWN - Play a randomish animation

Everything can be used with the mouse (or on mobile with the finger)
Respawn with double click

In this game left and right are constantly changing
either the players left and right
or the worlds left and right
goal is to fall down the right one , but because things are changing you might end up falling down the left one.