Feels like a mixed bag. I enjoyed many of the enhancements, but in the pursuit of keeping things accurate to the originals, this version just acts as a faster and well-lit version of Diamond. I had a much better time with my team this time, as I felt much more rewarded for building bonds with them.
The art style feels really strange, as they go for a chibi style, but something about it feels weird.
Diamond was the first game I ever played, so of course, I enjoyed this version, but the choice to opt-out of remaking Platnium feels like a missed opportunity. And of all the games they have remade thus far, these games feel the most confused in terms of their existence, as they mainly just bank on the nostalgia of the originals as opposed to forming their own identity.

And a moment to honor those who fought alongside me...
Zuko the Infernape
Howl the Luxray
Ethan the Staraptor
Suki the Lucario
Obama the Abomasnow
Judy the Lopunny
*Ravenclaw the Alakazam