The original game didn't have that "normal" difficulty so to this day I still consider "Hardcore" the real normal 🤭 I have this weird thing where I vividly remember this first game but can never remember what happens in the sequels elemayo. Not mechanically complex but still fun games I feel.
I'm somewhat similar. The first game is burned into my memory. Espeically the more horror-like parts such as when you fight the berserker, or face the kryll for the first time. But I can really only remember certain points of 2 and 3.