Hi!
I like the idea and I think it is well delivered to the player. The walk speed is great and I find it very cool with the darkening of the screen when in the dark. It gives a stressful but fun experience.
I did though not really understood the meaning with the different difficulties and got lost in the end of the first level when I came to the book. So maybe look over how easy to understand the subjects is and try to balance it with maybe hints or maybe some sort of slowing down the "eye meter" when coming to a new section in the beginning (With triggers or something).
But all in all, great potential and fantastic design! Love the beginning!
I hope this opens to a itch game page so I can follow the development process if you wanna expand the idea because I think you have something real cool on your hook! And that this was possible in 48 hours is just amazing, did you even sleep??!
Well, fantastic done and keep it up man!