Thank you so much for playing, but I have to tell you that you have encountered a bug. I slightly misplaced a "trigger" in the game which caused the game to end earlier. You were supposed to go further in the hallway, where you would encounter the monster (There would have been a "chase scene"). But I fixed the bug now!
P.S.: You got the "Corrupted Ending", the "SB-129" Ending is very hard to get.