I kinda respect using game maker with it's limitations. Also I dig the idea of murder case mystery and the game being story driven. The BnW noir style fits it well.
Few issues:
-Movement is pain due to lack of the diagonal movement (I see there was a reason for that in the comments below, but still). I've had trouble walking through the doors lol.
-Tiles blacking out are kinda cool, but I've had hard time finding a way to progress from the first area because the stairs were hidden untill I was few tiles away.
-Controls - I decided to go straight into the game, and I could not even skip through the first dialog box. Had to restart and enter Controls first to learn the controls. It's kinda not needed to make a separate menu tab for controls, when there just arrows and e key - you could just add ("*press e to skip the dialog or interact with stuff*").
-The story - seems kinda basic. On the other hand the game wanted me to take a decision on who's the killer before I even gave it a thought or walked around , so maybe there's more to it.