Parasite Eve 1 is still one of my favorite horror RPGs. Since the game was never released in Germany, it was a lucky coincidence that I had the opportunity to play it when it came out. I stumbled upon it by chance. I used to have a PS1 with a mod chip, which made it easier to have a larger library of games.
The combat system, the music, and the whole Christmas atmosphere are still unmatched for me to this day. The game is also responsible for my desire to visit New York, which I still plan to do :P
For me, it's the best part of the Parasite Eve series. The second one didn't really captivate me, and I didn't particularly like the combat system. I started 3rd Birthday but never really finished it. It's a shame that we'll probably never get a remake of Parasite Eve 1. It's just not popular enough, unlike Final Fantasy, for example.