A short demo but there's a fair bit to like about it.
Movement felt good, typically I find it really annoying when the player camera is too close to the wall but the mouselook solves that problem nicely. And I like how items are integrated into the environment so the player feels smart for using the mouselook to investigate for secrets and items.
The graphics are alright, not bad but the enemy models are very jarring in terms of quality compared to the environment.
The UI I think needs to be scaled up, several of the icons are hard to see. This could also possibly be remedied with tooltips explaining what a button is when hovering over it, but I think scaling the icons up would be better. I did manage to figure out what everything did but from reading the other comments here that doesn't seem to be the universal experience. I think the UI art is good though.
The combat feels kinda weak, there's no attack animation and there seems to be little to no feedback when attacking an enemy. It's basically just attack until the death animation plays.
For the most part though I think the games biggest issue is having too many mechanics for too little content. Though since this is just a demo I imagine that will be remedied later.
Overall though it was neat, good work!