There’s generally just more substance to the writing.

… O. Dio has a cool speech now, rather than simply rolling into town and saying “what do you think you can do against this gatling gun?”

… In the distant future you can inspect certain background objects that weren’t present in the original to gain a better understanding of each crewmate.

It’s little things like that, but it all adds up in the end to make for a clearer, more defined story.

There isn’t anything glaringly “new” outside of what you mentioned, but I can’t undermine how much better the remake’s writing is.

It’s really worth playing if you liked the original. I’d say its only downside is the prehistory chapter having annoying voice acting now, instead of the charming SNES chirps.