I actually really liked this! Quite a lot!
Can't really comment on the art as it's mostly dev art! (you could have textured those pillars tho) (joke joke heheh)
I really like tutorials that don't interrupt you at all. Also i don't think i was confused with the first mummy part, i thought it was a fantastic way to show it, as it surprises you. However, i can see how people can take it that way!
I don't know if it's the "i played escape the room games for too much time" part of me talking but i love cryptic puzzles with hidden messages and solutions. I would have just hoped there was a downside to using the true sight at all, other than being chased and stuff of course. Probably would have obscured most of the vision when you use it and only bright up the hidden stuff, making you have to toggle to actually see or something. Would have screwed up the chase part i guess, which i quite enjoyed. Really gave me the jeebies when you are about to get crushed and ambushed at all sides. Liked that!
Overall, great idea! Would like a way more polished execution with an actual artsyle, to not make it look so drab. Also, the walking is really really weird. I was really uncomfortable with it. To make it have the stepping animation it sometimes locks you into walking even though you already let go of the key!
Great stuff!