Those were some really neat effects! It was interesting returning to a previous spot to find that it changed or looped around in a nonsensical way. It gave my Stanley Parable vibes.
It would be a lot better if it was just more responsive. It was skipping frames for me even on the lowest setting (Although it didn't seem to do much worse at full screen ... weird), but also, the character doesn't start moving continuously until a second after you start holding the key, like it's set up to not recognize a held key until it is clear that the key was not just tapped. You may want to change how you are getting keyboard input, because that alone would be a huge improvement.
Also, I kind of like the use of signs on the floor. They give you something to read as you are walking, and they form some cool-looking patterns sometimes with the mirrors.