Well done! I enjoyed Coven, there is some stuff I think it's worth mentioning.
First of all, I loved the weapon variety, I think I've discovered all the available weapons for the demo (Axe, fork, dual pistols, shotgun, xbow, grenades). All the weapons were great but I really liked the xbow, specially because of the alt shot. I think you're going to address this later but I feel the grenade is quite cheap in terms of VFX (loved the resting hand pose though).
The visuals were great, I liked that the environment is breakable and that you can pick up some stuff like torches and crates.
At some particular situations I found myself running around without knowing what to do, specially the torch puzzles parts, maybe you can find a way to highlight the task the player must do.
I liked how you can slow down time (even though I didn't use this too much, I think it will be useful on later stages). Eating stuff is disgusting and I love it.
Overall this is a good demo, I really liked it. Keep it up!