Ideas for a Chakan Remaster/Remake

I’ve recently began a remaster/remake of Chakan the Forever Man (the classic Sega Mega Drive Game.) There’s a lot of stuff I want to do with it, but I’d like suggestions on how to make the game better than it already was.
Upgraded Sprites?
Smoother Animations?
Better Platforming (no matter what you say, that’s gonna happen.)
Different Level Layouts?

Any feedback would be appreciated. Thank You.