Akumajou Dracula X - Gekka no Yasoukyoku (J) ISO

This game is the Japanese version of Castlevania: Symphony of the Night for PSX. The game is a direct sequel from Akumajou Dracula X: Rondo of Blood.

Castlevania SotN, for Saturn. Not just a port, but rather a rebuild of the PS1 version, with Maria Renard as a playable character, and beginning a new game allows you to pick your character, regardless of game completion. Wanting to stand out from the original, much of the GUI has been updated, as well as effects, some voices, enemy stats, item rebalancing, new bosses and new areas.

More on Maria, she is a boss in normal mode (Heart of the Castle where you get the Holy Glasses from her on PSX) and a beast as a playable character: She has a triple jump, overpowered spells, fast movement and about 20x more health than Richter "The Glass Cannon" Belmont. There is literally no downside to picking her, which is what makes her OP.

I assume you are here because you have played SotN/Gekka no Yasoukyoku on PSX, so I can summarise the rest of the game with one word:

Lag.

For speedrunning, or just doing simple spells, the lag can kill your button inputs (wing smash, soul steal, the Richter whip dash). And that is on a real Saturn. I cannot even imagine how laggy it gets on an emulator.