Good old dithering! Really nice look & atmosphere. Maybe you’ll be interested in a thread by the developer of Return of the Obra Dinn about how his dithering approach works - he greatly reduces flickering when you move the camera.
Gameplay-wise, I couldn’t really understand what you’re supposed to do. I moved through the whole map 5 times and only found two pieces of paper (with no apparent clues), some mice, and an occasional ghost. Did I miss something?
Anyways, good job, looks like a nice game!