First of all, I really like the low poly aesthetic and how all of the assets work well together. The mechanics are by far the best part about the game, I think that being able to look through the computer is very impressive and is at a professional standard. The other mechanics are really cool too like opening and closing the barrier, pulling the lever for the light and being able to pick up the box and move it around, I was also impressed by the keypad puzzle, as it took me a few tries to get it right.
I like the dialogue mechanic too as being able to see what the main character is thinking/saying opens up a whole new avenue of ways to tell the story you created and for me was the best way to understand the situation the main character has been placed in.
However, there were a few things I noticed that need to be changed or fixed, the main one being colliders as I was able to walk through the car as well as jump through the roof of the building and land on top. Also, to me the players camera view is too low as the desk with the computer seem really tall. I also had a bit of trouble with the camera and mouse cursor themselves as when I would look around, the cursor would zoom to the other side of the screen which made it a bit difficult to open draws or select anything on the computer. I also wasn't too sure what the blue cube on the floor was and when I would pick it up, I would lose sight of it when I looked around because of the cursor.
Other than that, I think this is a great start so far as you've added some really cool mechanics to the game and the whole atmosphere is great!