No greater compliment than calling a game a "new Might & Magic," you really made my day with that! Thank you.
I love playthrough videos like these. It's very educational to me to learn what works and what doesn't work in my game. For example having a portrait on the wall where the rest of the walls are empty feels like something special that should be interacted with but that wasn't clear to me at all while building the game.
I think the difficulty ramp wasn't super obvious, something that was made clear watching your play through. As for finding the mask, well, you certainly can if you play well enough but there is an even greater reward waiting for you than even that!