I'm not sure where the person you replied to got their information.
Neopets currently has 14 games on their Games page.
In their Medium post, they say they have plans to integrate Ruffle to make "more than 50 games" playable starting on July 25th. They also "hope to convert many of the most beloved games to HTML5", but they've also been saying that for years.
I assume you've played or heard of Yooka-Laylee. There's also Clive n Wrench. Neither of those are great though.
I haven't heard of Koa before, but it looks interesting. I'll have to check it out.
But I really want a new Banjo game, however I doubt that ever happens at this point. I recently started working on my own Banjo clone in the Godot game engine because I don't see anyone making the kind of game I'm looking for.
Hasn't been since 2005.