I can look into adding explicit options for this to a later revision. In the meantime if you're on Windows the game should support "alt+enter" to exit fullscreen.
Ah, there is a half-covered passage in the middle of the right wall in that room. If I do another update I will remove the leaves in that. They were meant to introduce the path type I'd be using to hide secrets, but those secrets got cut from the final version and you're not the only ones who've missed the path.
