Hi,
Wow... uh... i am sorry because the game got some bugs while you played...
To explain quickly if you want to play another time :
There are keys : can open every locked doors but not the main door
The Master key : can open the main door but not the others
The gun : can shoot at the intruder
I am not sure if you actually liked the game '°_°
Think i'll have to do an update :)
Still hope so
See you soon ;)