The demo looks good, models and effects are made well and fit nicely into the "dungeon lurker" setting (at least that's the vibe I`m getting from them). It`s easy to see that there was a lot of work put into them.
But I can`t say the same for gameplay for now. Problems in descending order.
First, 2 rooms are simply not enough.
Second, there needs to be some kind of tutorial, controls and movement are not intuitive for novices (maybe pop-up keybinds at least?).
Third, weapons, either add some projectile to the gun, so it would be usable at range, or add some melee weapon, but keep the damage distance. The ideal would be both options, but maybe you want only melee, who knows.
Fourth, background, I think it`s too uniform, combined with lack of lighting apart from halo around our character it makes levels look bland.
Overall, nicely made demo, hope to see it grow into full-fledged game.