Really liked the game. Cool setting and nice puzzles. Would very much play a continuation/extension.
What needs to be done IMO is making sure the player isn't 'lost' in the first 5 min of playtime when he can't get out of the first room. By experimenting with the fire bowl I could get my left hand on fire and trying to bring that fire to the empty torches was a natural thing to do, this puzzle I could solve within a short amount of time.
Of course I also noticed the shiny plate on the floor with the RA-Symbol and I noticed the strange 'thingy' hanging from the wall. But at least for me making the connection that the 'thingy' is supposed to become the missing arc from the door didn't happen, I only watched this in the video from Whit30. While some amount of supernatural dealings are to be expcted from the setting, I simply had no idea that I would be dealing with that kind of possible solution.
When I' playing games like Fresco (http://frescogame.com/), this is obviously expected. But I fear that many potentials players will (like me) not 'get' this puzzle and just stop playing because the game ends there for them. In addition, the 'put your left hand on fire and use it to light torches' mechanic is explained in the big hall that follows, where it is "too late", because the player already needed that in the first room.
Tl;dnr: Nice setting and ideas; gently pushing the players in the right direction at the very beginning needs to be done IMO.