Help in TurboWarp

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i'm really not sure how i can do it, it's really difficult.
since yesterday night i'm trying to figure out a way to make it dark, can somebody help me (who knows how to use turbowarp) to shade this hallway?




Does anyone know how to recreate ground physics?

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What decorations should I add to this?
Can somebody do a tutorial on how to use joystick movement in turbowarp? BC I'm making a platformer.
Guys, how was the code made to change the colors of a vector with the looks plus extension?