Not going to focus on how dark this demo is, although I totally agree, it doesn't need explaining again! I've no doubt the devs aren't developing the full game to be played in total darkness lol.
Otherwise, lore seems really interesting. The core mechanics feel pretty solid and, once the lights are on, the game starts to feel really damn good. It goes from 'not sure about this one' to 'yeah I need to play the full version of this'.
The SH and RE references are clear, I also got a big 'Lost in Vivo' vibe from it. I think it's the low poly assets that are more complex than PS1 stuff, but with that dithering effect and 128/256 textures to dirty them up.
If the rest of the game can remain intriguing but give enough direction to not become confusing, offer a decent challenge and throw in a few scares then I've no doubt it'll be a huge success. Well done!