Mystic Quest. Gets a lot of hate for being too simple and labeled as an RPG for babies - not exactly untrue. However, its soundtrack hangs with the rest of Square's greats in my opinion. I also thought the way you used tools to interact with the environment was pretty fun. Axe for chopping wood, bombs for blowing up holes, claws for climbing, etc. It was cool because those same tools and weapons could be swapped between during battle, and certain enemies were weak to certain weapons types. Story wasn't anything special and the combat was pretty easy, but still it had some great ideas and I find myself still putting on the soundtrack regularly.
I agree; it was great in it's own simplicity and creative design that it didn't
need to be a darker, more mature storyline to get players involved and invested in the quest to save the world and the crystals along the way.
I thoroughly enjoyed every bit of this game, and to me (as well as a lot of others back then) was just another off-shoot RPG from the main series that held up well-enough on it's own merits.
The fact you needed to jump and consider weaponry for your situation gave it a slight (very slight) puzzle element, which kept dungeon exploring from drying out of it's fun-factor, making it more than a simple crawl-slowly-through-dungeons experience for most people.
The presentation (I thought) was fantastic, and I love that it gave players the option to go with numeric values for preference, as well as the default layout of the HP bars, which also made a lot of sense back in the early days of role-playing video-gaming. It was easy to keep track of, like Ninja Gaiden.
The story, while wholesome, was fresh, and introduced a bunch of interesting (if not somewhat trope-y) characters, all with their own weapon types that suited each of their personalities and career-orientations, making them a bit unique as individuals in the game.
My only complaint is the fact they didn't test Falls Basin properly, causing players to freeze the game and get stuck with (heheh) no way to progress from there on out, a major flaw for a game of it's nature, especially back in the day; but it wasn't enough to keep me from eventually finishing it anyway. And they did re-release it, at least.
All in all, I thought it was a wonderful experience as an RPG, with a fantastic soundtrack by Ryuji Sasai and Yasuhiro Kawakami.. What? A Final Fantasy game without Nobuo? At that point, most players would assume the game sounds like shit. Then you get into the first battle and Oh My Gosh, it's like a rock concert going on in here!
I have very little in the way of bad things to say about this game, apart from Falls Basin in the v1.0 release.