Wow, I just barely missed you with my last comment, huh? Anyway, I discovered another glitch: if you speak to an NPC while using the Hikkori Skull's phasing power, you'll still be able to move around and jump while the dialogue box is on screen. Granted, the Hikkori Skull is rare enough that most players probably won't ever encounter this minor bug, but I thought I'd let you know anyway. EDIT: Also, doing the Hikkori Skull glitch while entering a door turns the player invisible until the next room loads (so only a fraction of a second).
I guess you could always just put this in your "Known Issues" thread if it's too much work to fix for too little gain.
EDIT: Also, is it just me, or is there no tutorial for panning the camera up/down? I only figured that out after I kept running into surprise death-falls in levels like Monument Valley and Massively Makeshift Bridge, but I had just assumed I forgot about that mechanic at the time. However, looking back, I don't think the game ever explicitly mentions its existence, so it'd be nice if you added some text explaining it somewhere in-game.
EDIT 2: You said you didn't change Yal's world 5 convo because you forgot to add it to your list. Did the same thing happen with removing and replacing the invisible blocks in those two levels that still use them, or did you simply disagree with my criticism?