Although it is set in an apartment, All Alone is head-and-shoulders above other such room-limited games, because it successfully induces all of the claustrophobia that other games only hint at. Here, claustrophobia, paralysis, and isolation, all spiral together into a cold sweat of undiluted terror. On the analytical side, this is pure stalker-horror with the player as the potential victim. The setup uses the limitations of the setting and even of IF itself to bring the aforementioned emotions into play. It's quite effective, and the emotions are compromised only by the profanity towards the end.
However, there is nothing original about the antagonist, and the PC's inability to fight back is also rather stereotypical. I found it frustrating that she could not use the phone as a weapon or that she had not taken any precautions at all, especially given that there had been multiple murders recently.
Still, it is a well-done example of the stalker-horror genre, and it's worth playing.