Rainbow Maker!
This game is from the old Ludum Dare platform. You can try viewing the original page on Web Archive
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In this game, one controls the growth of a rainbow and your goal is to pass through all of the stars in each level. There are but two controls: Space causes you to jump, and down arrow causes you to bounce off of things with perfect elasticity. As you move, you leave a rainbow behind which then acts like a wall in its own regard and may block your path or be your path depending on how you use them.