Thanks for the detailed review, at the first puzzle there are noises that indicate a "fail state" each time, as well as a lamp turning on when you get the combination right. Furthermore the actual code is hidden within plain sight if you utilize the cameras B/W mode by pressing F. Sure there are room for improvement with those.
Thanks and hope you will enjoy my upcoming titles!
Wish-list Residuality: https://store.steampowered.com/app/1810650/Residuality/
Dead Faces Trailer ( Will have free prologue demo + Steam release )
Stay tuned for more madness :)