Weirdly, the games that felt to me the most like Myst were not of the same genre (instead, they were D2-ish), graphical detail (they were glorified board games with a few frames of animation) or mechanic (they were RPGs).
They were called the "Avernum" games. They started their life as flash games. They had bottomless writing and story behind the franchise, to compensate for their near-total lack of visual splendour (unless you're into map reveals) and graphics. I don't know why they felt like Myst to me, given their procedural and eminently surmountable nature, but still . . . they held, and still hold, that same sense of wonder and exploration.
I think there are a few other games from "humbler" (intra-WWW-revolution, drowned out by the Flash revolution noise) beginnings that are similarly excellent.
I think you've got something mixed up. The Avernum series was a set of RPGs, but they were a remake of the creator's earlier Exile series, not a Flash game. (Exile I: Escape from the Pit was released in 1996, long before Flash was viable for this sort of game.) They weren't procedural at all, either; the content was all handmade.
Exile was my jam. I could never quite get used to Avernum, much as I liked being able to see many more tiles on one screen.
Part of it was the controls: I preferred a proper top-down view over isometric, but the main reason was probably the fact that parties were smaller. In Exile, a party could be 7 characters (I think), and it made the combat feel much more tactical.
Still, both the Avernum and Exile series are amazing, and I can highly recommend them. If you're starting fresh, Avernum 3 is probably a good one to start (it's also the on iPad and decently playable).
They were called the "Avernum" games. They started their life as flash games. They had bottomless writing and story behind the franchise, to compensate for their near-total lack of visual splendour (unless you're into map reveals) and graphics. I don't know why they felt like Myst to me, given their procedural and eminently surmountable nature, but still . . . they held, and still hold, that same sense of wonder and exploration.
I think there are a few other games from "humbler" (intra-WWW-revolution, drowned out by the Flash revolution noise) beginnings that are similarly excellent.