At first I thought the mark was just for fun, but when I stepped into the last room, I immediately understood the intention XD. I'd love to solve more room puzzles! One idea I had from my first look at your game: the Ames Room. Might inspire you.
Thanks for your tip, I struggled to come up with more puzzles so I'll check that game out. My game is a bit inspired by This is the only level, I bet you'd love that.
