So I managed to play through the demo tonight from start to finish. Yeah, the 3D environments feel like a rather vanilla Unity3D game, there's really nothing much to them. Models are basic, there isn't much in the way of shader effects, and the game looks like it came from about 2006. Textures are alright though, and there is a certain charm to the game, I will give it that. But at the same time, there's nothing really incompetent about the engine, it does what it needs to do and nothing more.
I don't have a super high resolution monitor, just 1080p, but I was playing the game at 2560x1440 downsampled, and I do notice that the video does look much cleaner than anything at 1080p. It's honestly nice to see a game that doesn't use those horrible Bink video codec packs. The video quality in this game just looks phenomenal, this is how to do FMV right.
As for the game, the puzzles remind me of old Resident Evil games, not too hard but good enough to keep me invested in the game. Some of the actors in the cut scenes are a little iffy, but nothing bad. Overall, there is a B-movie nature to the game, but I find that to be a good thing. The writing is very sharp though and Tom Servo seems to be your sidekick.
The Navigation is OK, simple right click circular menu, here's not really much too it. And it's nice to be able to save anywhere.
Overall I rather enjoyed the demo, it does have a certain charm to it and it is kind of a trip to play a modern FMV adventure game in 2014. I actually want to go back and play the old games now.