I gave your latest demo a spin and here are some of my thoughts:
Visually it works alright, as a short snippet of something that will be, without a doubt, larger its hard to gauge what art style you are going for. You see, I gathered that I was in a warehouse but that was really it. Some anachronistic stuff here and there, like certain scifi elements mixed with urban decay didn't go so well with what I assume is a modern day setting. You also submerged one of my scifi fuse box props into the floor, but the handle is still visible
Generally it was alright, the puzzles where easy enough to understand and the game ran fine.
My biggest gripe of the game was with the voice work, not the quality of it, but the fact that it was used so frequently. It seemed like the character is constantly muttering to himself and given the tight spaces of the level, it was easy to trigger two at once and have the character talk over himself. You also have kind of a late night radio jockey voice for him which makes it seem like he is relaxing with a glass of wine...maybe had a valium to go with it...rather than a guy in some kinda armed conflict. I know voice work for games can be tougher to do than expected first hand but I believe you should overhaul this before you go for a final release.
There where some visual quirks here and there... things that should emit light not doing so, things that emit light not being lit entirely, objects from GG that have LOD stages flickering... so on.
What really stood out to me was the chill overall tone and the great music! I think you could really make this game work if you put your mind to it!