[quote name='Zmonkay']Saturn:
I wouldn't say (other than Astal) these are lesser known, and aren't survival horror, but these were my faves back in the day:
Astal (great 2D game most people don't know)
Legend of Oasis (only played briefly at my friend's house back in the day, but I remember really enjoying it)
Nights into Dreams (if you have the 3D controller)
Panzer Dragoon
Panzer Dragoon II
Panzer Dragoon Saga (haha, good luck finding an affordable copy. I've never personally played it either, just heard it was good)
Sonic R (I'm gonna get flamed for this, but I really enjoyed it at the time. Haven't played it in ages, and most people hated it, so...)
I'd also recommend any Capcom 2D fighting game (Xmen Children of the Atom, Nightwarriors, Marvel Super Heroes, Street Fighter Alpha etc) if you like those, as they are near-arcade perfect ports (unlike the nerfed PSX ports)
That's kind of it... hehe. My memory of loving my Saturn and it's games is clearly clowded (Space Jam! Jurassic Park! Dragonheart!... wtf was wrong with my young gamer self haha)[/QUOTE]
I will echo most of what was said here at the beginning of the list though I haven't played the second "Panzer Dragoon".
For fighting games definitely especially Vampire Savior and all the VS. games which are arcade perfect, especially X-Men Vs. Street Fighter.
I'm a big "Burning Rangers" fan as well which is a definite recommendation and play it with the Nights pad as the Sega people made it clear it plays with it.
Get "Mega Man 8" on the Saturn as well as it's the definitive version of "Mega Man 8" even now since Capcom were too lazy to port that version over to the Mega Man collection.
Games that are overrated: "Akumajo Dracula X". I own this and while I do enjoy it the slowdown at times is just plain crippling due to it being a shoddy port. It is WAY overpriced on eBay.
I would suggest the D&D Collection as well unless the arcade versions of both are cheaper.
Lastly for Survival Horror you may want to pick up "Deep Fear" for the Saturn. It's an import but is in English anyway. Oh and I see no one has suggested "Enemy Zero". This game is by Kenji Eno as well. Since you said you liked "D".
I've played "Lunacy" and definitely recommend it. I might argue the story is much better then "Myst". I have a sneaking suspicion that the same story director or writer is behind "Shadow Of Destiny" as well. Unfortunately I can't find the credits list for "Lunacy" to confirm this or not. They may be behind "Folklore" as well.