Runs smooth in browser which is always a relief with 1st-person WebGL, so good job there. The floors are interesting to solve too. The first one intrigued me right away. That and the invisible floor room were probably my favorite. Visually, it nails that in-between space.
It's not full horror, not cozy either. More like a dream that starts to feel off the longer you're in it. The chromatic/glitchy effect really helps sell that unstable vibe without overdoing it. And then yeah, that guy popping up randomly absolutely pushes it into nightmare territory for a second. Definitely gives off that uneasy feeling. I also liked how the pace of the text is delivered to you as you go higher, and gives just enough narrative progression. This game is well put together.