Up arrow moves up, down arrow moves down. You get pulled back to the center when you release the key. Avoid black. Don't touch the top or bottom. Note: If you die and then try again sometimes there will be a bunch of blocks, just die again with a score of less than 6 and it will be back to normal.
Sorry I haven't made anything in a while! I am working on a Jetpack shark game. Music is Clutterfunk from Geometry Dash. Try to find both secret endings! (It will say something other than Center of Gravity occasionally when you die.)
