I struggled a little in the beginning with the controls because I have a junky mouse (also, keep in mind that not everyone has a middle mouse button!) but then was able to play properly. Is there a reason you didn't just use keyboard movement (up/down for forwards/backwards and left/right for rotating the camera)?

The game has an interesting premise but, like @sMashZa, I guessed the correct answer based mainly on the last letter and don't feel that the other letters really gave too many clues, they just deepened the mystery. I feel that the game needed a few more clues and objects to interact with but I presume you did what you could with the time constraint. I quite liked the floaty visual style of each room being a separate block.

Cool game! :) I thought the letters were well written and the art style is quite unique. Unfortunately I'm a very bad detective. I ended up guessing the right solution at the end, because I could not link the letters to any of the solutions... 

I like the minimalist art style!

Very cool story. Interesting gameplay.

Really fun detective game! Not sure if I solved it in the correct way, found all the keys and got to the bedroom and then guessed between the two options that made the most sense given the last letter. 

One thing I would say is don't allow the player to pick up letters/interact with objects if they aren't in the room, but otherwise was a really fun little game