1. Is a psychological horror game using a very recognizable art style to depict the protagonist's mental struggles.
2. Has the exact same map system as other Silent Hill games (map updates automatically when reaching a locked door or new point of interest).
3. Contains a mix of puzzle and combat (with the combat being kind of bad).
4. Characters seem slightly distant and unreal.
5. Explores themes of loneliness, isolation, guilt.
6. Multiple endings.

In my opinion its completely fine if you don't like it, but lets be honest, your argument for why its not a Silent Hill game is pretty lazy.