Well, the way I intended it to be played was to move the rectangle over the tiles that were orange, purple, etc. and then go to the opposite color tile to go to the next level. It's why there's several tiles that are orange, purple, etc. I apologize for not making that clear in the instructions. If you look on the page for Dissolving floor, daniellesgames.itch.io/dissolving-floor, though, there's a gameplay video.