Hey it's me again, I just played the updated version, so here's what I have to say.
First up, optimize the game. My PC can run Minecraft with dozens of mods + shaders and not even heat up my computer anywhere near as much as this game does, I had to stop the game because I was worried my PC was going to explode or crash from how hot it was getting. I notice that the game seems to take extremely noticeable frame drips in both the main hall and dining room area, so there must be something in those areas causing the game to use more memory processing power than it should.
I'm not exactly sure what you are using for instantiating the rooms but I highly recommend looking up something called object pooling, it really helps with optimization, and as much as it pains me to say this, I'd actually recommend not making the game seamless (i.e make each room it's own separate level) unless you manage to optimize it really good so it doesn't make my PC feel like it ingested a nuclear explosion. I wouldn't mind the loading door transitions of the original game, if anything it added to the suspense.
I also noticed that opening the inventory no longer works, I'm not sure if you disabled it or rebinded the key, but if you are going to regularly update this demo, make a changelog that lets us know what has changed, it helps to keep track of things this way.
Also, thank you for fixing the reloading bug with the hand gun, it was a nice change, but I also noticed you have no way of healing wounds in this game, even though herbs are a thing now.
Keep up the good work man.