I really love the visual direction of this one from day one while you posted it on Twitter. Simple yet elegantly beautiful. The atmosphere is very well established with all the sounds and design. But like many pointed out below I was having trouble figuring out what the objective is. I spent quite a while running around interacting with objects and picking up masks wherever they appear. I saw the color of the gem changed and the sound of the object change but other than that I'm just wandering around endlessly. I don't know why, but I've found the atmosphere a bit creepy as well, like anything can pop out at any moment 👀.
But overall, great job! The game feels very polished and complete, no bugs to be found (yet) which is quite rare for a jam game, so kudos for that! Presentation is top notch.