Classics you'd still like to play/beat, but haven't yet?

The isometric platforming is what it is. You'll fall down holes to lower dungeons levels and have to make your way back up to try again a lot. It's still a cool little game, though. The lighthearted tone really makes it. The whole game is one big humorous caper as you race your rivals to a treasure, not just another angsty JRPG quest to save the world from the evil empire or whatever. I like it a lot, even if I don't like some of the platforming.

I'm a fan of Landstalker. The complicated platforming sequence you see in the intro is to establish the character as a kind of fantasy Indiana Jones; most platforming parts in-game are a lot shorter and simpler. The isometric view and the corresponding controls take some time and effort to get used to, but I've always found that people exaggerated the difficulty of the platforming. I could usually get a feel for the jump required just by looking at the platforms, even without shadows. There aren't really that many variations in terms of distance or direction; you can usually get by with just short and long jumps, with just a few somewhere in the middle. This is probably true of most actual platformers of the era, too. But yeah, even that being said, you'll definitely mess up some jumps. Contrary to old-school platformers, though, failing a jump doesn't mean you die, so it's not so bad.

Of course, the game focuses more on puzzles, but these are what I'd call "action puzzles", or basically trials; you can usually tell what you need to do at a glance, but it might be difficult to execute. It's definitely an action RPG, by the way, in every way that matters. Compared to A Link To The Past, there are several actual towns and more of a RPG-style story progression.

Alundra is the best action RPG ever made, in my opinion, and definitely a continuation of Landstalker's game design, minus the isometry. The story is much more dark, though, to a surprising extent. That town really goes through a lot. In contrast, Landstalker is quite lighthearted and adventurous.

Dark Savior on the Saturn is pretty decent and interestingly experimental, but ultimately I think one longer adventure would have been more satisfying than the "parallels" system. Basically, there are several completely distinct routes through the game, depending on the amount of time you take to finish the short prologue. To really understand the story and properly play through the game, you have do all the parallels (they aren't very long, and there's not a lot of redundancy). There is one 3D mine cart level I really, really hated, though. I found it incredibly difficult and annoying, far more than any of the platforming in Landstalker (or Dark Savior, for this matter).

Alundra 2 is disliked by some because it switched from 2D to 3D and from a dark mature story to an outright goofy cartoon, but the core gameplay and dungeon design style is still thoroughly solid. Ultimately, I really liked it. 

The Ladystalker translation is still waiting for the day Ghideon runs out of mediocre mecha games to translate, and Climax Landers, aka Time Stalkers, is actually a pretty good turn-based roguelike in the vein of the Mysterious Dungeons game, except it also acts as a Climax crossover game, with characters from Shining in the Darkness, Landstalker and more. I think it was unjustly maligned because Western console gamers weren't acquainted with roguelikes at the time. I remembered lots of complaints about Levels returning to 1 when you left a dungeon. Finally, some people associate Steal Princess with that whole unofficial series, but that's a mistake. It's purely a puzzle game, divided into short levels - there is no adventure or RPG component, practically no combat, and not much of a story.

There was also some short Net Yaroze game that was clearly inspired by that whole spiritual series, but I'd always get stuck in it. It's usually held up as one of the most accomplished Yaroze game, but apparently it's only like 20-minutes long if you know what to do.

Legend of Oasis was one of the first Saturn games I finished, and one I spent a lot of time with, as it was the only Saturn RPG I could find locally at the time along with Virtual Hydlide. I actually called the Sega help line advertised in the manual because I got stuck somewhere after missing a key. It's a pretty complex game, or at least it seemed so to 12/13-year-old me. I really enjoyed both it and Beyond Oasis, their spirit system, and the chunkier, more physical combat.

Got any particular issue with it?

And yeah, the Tron Bonne comparison is on point for Alundra 2, that's exactly the tone it has. I'm pretty sure they went for it due to criticism over the first game's grim story, as it's such a complete 180.

Not sure this counts as a classic, but I've always been intrigued by it. I bounce off of it every time, though.