Use the arrow keys to move. You should see other people. Those are other people's playings of this game. --DISCLAIMER-- The other players you see are NOT actually playing at the same time as you. They are just recorded data being played back. https://scratch.mit.edu/projects/44878408/ If you remix, make sure the "Clicks" variable is set to 0.
RSMULTIPLAYER HAS BEEN RECORDED. Credits by Hobson-TV