Really clever mechanics. It took me a while to understand the level-shifting mechanic but when I did it was pretty fun! I also liked the general atmosphere and story.
I wish there was an indicator to where the keys might be though. It often felt like I was going in circles and having no idea where I should be headed because you can't see much with the zoomed in camera. I also wasn't a huge fan of the level shift triggering randomly as you walk around, it felt frustrating to know where a tile is and have it go somewhere else as soon as you look away. Other than that, great game!