I've needed to use the EasyRPG player (https://easyrpg.org/) to run this game because it flat out refuses to otherwise (Something about DirectDraw not working & such, definitely something up with RPGmaker and not this game specifically) but luckily it seems to go along without any issue. This does mean that I can't be entirely sure if any bug I encounter still exists when running the game "raw" though. So far the only hitches I've encountered was 1: In the very opening with the stalker, a couple times when i was caught by them the game entirely locked up (as in, didn't crash but I couldn't move or open the menu) and I had to forcibly close it. And 2: In the rooms of the staircases area with the worm things (?) that jump around, after a moment they all end up jumping into the walls and not jumping out. I can't tell if that was supposed to happen but it did clear the path so I wasn't complaining too much.
Viewing post in GLITCHES, weird issues, etc.
I have tested a few of my games on EasyRPG Player and while it's handy to have RPG Maker games portable, I've found it does produce its own share of bugs and errors. Not sure about the crash, maybe EasyRPG handles something out of order sometimes and trips up? The bugs it generates where otherwise there are none are always very strange. It also likes to make tiles face Up unexpectedly, which can cause things to look wrong.
The things in the STAIRCASES are indeed meant to disappear into the walls/out of your way, though.