Sure! I'll add an explanation on the game's page. Thanks for playing my game and for the suggestion!
You're supposed to go from one white platform to the other while scoring as much as possible (the first level is trivial, then it gets a bit harder).
You score by:
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Collecting the Rubik's cubes
Having as many blocks as possible annihilated
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Having as much time remaining as possible
As you go around the level, you mark areas: first red, then green, then blue, and finally yellow, and that keeps repeating. Once you have four areas marked, blocks of those colors start falling above those marked areas.