Double click the green flag, Arrows, WASD, or Drag to move (if you set it to mobile). Don't touch the enemies. Get to the Elder Blokk to get to the next level. Yes you both have to get to him if it is on multiplayer. Yes I know it glitches. Just Deal with it. And yes... I know the colors don't match perfectly. I was not the best at coding when I made that feature.
I know, it's not the best. I stalled finishing it for 2 years. I just wanted to get it done.