First of all, take everything I say with a grain of salt cause I don't usually play games with this type of mechanics, so I am definitely not your target audience. I managed to open the gate with the 3 sigils and the gate with the clock and stopped once I got lost in the mirror maze.
Storywise, I think you had something very interesting going on and would have loved to know more, most of the time I felt a bit too much in the dark and wanting to have more information as I progressed or explored the building. It caught my attention from the start and so far the 4 characters I found were very intriguing and would have loved to know a bit more as I progressed.
Mechanic wise it took me until the mirror to realize I had in my inventory two books that explained the stats and that actually fighting everything was bad, so I probably made the game harder to myself without even intending too lol. On the other hand I found really interesting the mechanic of some enemies only reacting when you ran past them, and being able to walk around unnoticed, it pushed me to not sprint constantly and try maneuver around the enemies if I didn't felt like fighting.
I liked the loot system, and being able to level up your Fortune to find better objects, my only issue was not being sure what I could interact with and what I couldn't eventually I figured out most barrels, boxes and bookshelves could be interacted but I don't know if there was something else I missed.
Overall I think it is a very cool game and will try go back and see if I can get farther once I am done playing the rest of the games in the Jam. I was also very surprised to see a seemingly 3D model as the player, I didn't knew you could do that in RPGM.