I couldn't really find any faults with the demo, apart from the door to the code puzzle room randomly disappearing when I walked through it, and the fact that the demo ended so abruptly, I thought the game had crashed for a moment.
I think that this is a fairly solid demo and a good taster for what's to hopefully come. The correct pieces are definitely in play here, so I hope to see this project come to completion some day.
I hope you don't mind but I made a short let's play of the demo for my channel.
Cheers and best wishes!