I will say I had nearly as much of a good time with those two games as with Riven. For all three, I had this sinking feeling while playing "I will rarely find works as lovely as these in my life".
There was definitely something appealing in these lower-resolution rendered graphics for the way they hid the imperfections of computer graphics and conveyed more detail than was actually present. In a way our minds filled the gaps.
A good example of this are the trees in Myst in this image (https://i.ytimg.com/vi/E9ZtXtFXE84/maxresdefault.jpg). They're just textured cones with a central cylinder, but as composed they look far more richly detailed.
Not even close to accurate
One that stood out to me is "Odyssey - The Story of Science", which is a Myst-like with focus on teaching basics of math and physics through its puzzles.
It was not too bad, but my memory of Riven is so much stronger. Maybe I should replay it instead, just to walk through this beautiful world again, even without solving all the puzzles (the puzzles are IMO not why you play it). Riven evoked this constant feeling of wonder with the sounds and short cut-scenes adding a lot to the atmosphere.
There was this place where you walk down towards the water with a beast sitting there in the sun, and that scene almost has a smell to it. Or maybe my memory is colouring it all rosy now.
the recent myst remake is probably the pinnacle of them... that said the original is well worth playing still and i've played it through a few times now.
I tried it, and it plays atrociously. Extremely inconsistent FPS, sound choppy and cutting off during movement as new assets are loaded, graphical glitches, just horrible. I refunded it pretty quickly.