The yellow smiling monster is you. You have to get crystals by moving the yellow monster to the crystals. that way, you score points. Though if you are caught by the evil red monster it is GAME OVER. The evil red monster can score points too the same way you collect them. The crystals never disappear. You can switch the backdrops by directing the yellow monster onto the green button on the top right corner.
this is one of my first projects