Thank-you for documenting such a thorough playthrough, and finding some nice bugs to squash as you went. I'm glad it went reasonably well.
Lots of good observations and things for me to consider moving forward. I feel you on various points, and I'll have a look at communicating one or two extra things as the player potentially misses something. There even used to be a vendor for the ?S, but I removed the option when I added their usable stat boost effect.
The Columbarium has always definitely been a trial, their positions are highly variable and they flip between movement methods when you go in and out of hiding, so it can produce quite a wall of sorts as they try to prevent your entry. I kinda like it because they don't grind you down rapidly, just one sanity at a time, but I could easily enough look at a wider path or more stairs to the entrance or what have you.
For T.Layers, I am pretty sure there's enough SIGILS to open all the GATES, but it's hard to figure out if it's nonetheless possible to break it with some unexpected order. There's two red, two blue, two purple and one black, and I don't think any are locked behind a colored gate, so it seems to be okay on the surface. I know I sometimes get lost trying to find them all myself.
All in all, an interesting examination of my game, and I hope other people find something to enjoy about it or some bug I can improve the game by fixing.
Thank-you very much for purchasing HOME GAME 3, and I hope more LEWIS finds you next time!