Minimalistic graphics work well if there's just a little something to it that is more than just the plain interface. For me in this case, it was enough that "I" was represented by "i" whilst trying to not rely on my "eye" this much. Puzzle games are an ungrateful genre with only a small space between effordlessly doable and too demanding, which both result in frustration. In this case, once you know what you're doing, you can rush through it in four minutes, but figuring it out from the start took me 22 minutes. I think that's a good use of riddles and puzzles and fits the genre quite well.
Unfortunately, I also had very low fps when moving pc and camera simultaneously which made certain parts of the game harder than necessary.
Quick access to every single puzzle is just what so many games lack, thank you for just implementing it.
If you plan on continuing developing games, there's been done much right here that you can keep building on.
 "The Illusory Wall"){kind=icon}