I hear you, but I also hear Alec's point - Take Xenocrisis for example. Here's a modern game developed specifically for the Mega Drive and the "upgrade" to the Neo was half-hearted at best. I'd rather just play the MD version as the Neo version didn't take advantage of the hardware in a meaningful way aside from a slight color depth upgrade and some superfluous still art cutscenes.
Natsume's modern Ninja Saviors, a modern-upgrade to the SNES Ninja Warriors Again is a prime example I think of what you're talking about,
@Tarma ? Even though Ninja Saviors is not a Neo game, it's that style upgrade you're looking for I'd wager? Bigger, better sprite work, richer/fuller soundtrack, slight upgrade to mechanics, more effects and sprites on screen, etc.
It's an incredible game, and it almost feels like if there were an "arcade Neo original" the SNES version would have been the port.