Knock-knock is really more of what I'd call an art game, with a lot of loving attention to graphics, sound, and poetic turns of phrase. It's a short, interesting little experience that the creators describe as a 'meditation' rather than a 'game' in an opening text blurb. If you want an artistic experience exploring things like loneliness and psychological trauma, or you're open to a weird, different form of horror, and you're OK with storytelling that raises questions and then lets you think about them instead of handing you the answers, then get this game. If you want a standard horror game like Amnesia you should possibly go buy Amnesia instead of writing a critical review when this game that never claimed to be Amnesia is not Amnesia.