I analyzed the level, and whatever you do, It is unsolvable. you'd have to reach the left corner as a red shape, but reaching that corner is impossible as a red shape and there are not red switches in that level.
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Thank you for your input, BuyMyBeard! I have suggested players who had difficulty to solve Level 11 to try the game build on another site https://gd.games/ikmalsaid/timeshifter