The concept is quite fun!
The tutorial introduction was funny, but a little slow. Also, losing movement everytime the guy says something can become quite annoying. Maybe add dialogue to the game (as well as sound in general). Playing the tutorial also breaks the game, so maybe wanna look into that haha
The textures of the floor are a bit busy on the eyes, perhaps extend the texture to the walls, as to not create too much contrast in a little area. The puzzles are also quite easy, maybe make them a little more difficult.
The dash mechanic is really nice, but maybe add it to Spacebar instead, as LShift doesn't work quite as nice with WASD. The dash is also slightly buggy, as you clip through walls sometimes.