I ended up not making a green forest, which saved me a lot of time. Despite not being able to go through with the original plan, I still think it's a satisfying end. If I ever want to continue with the idea, I can make a path to the rocks and let the player go through a waterfall, which leads to the same idea of having a corridor that leads outside.

The switch puzzle requires only 3 switches to be activated. Once you activate the wrong switch or in the wrong order the puzzle will reset.