So graphically, it's been improved with more details

But the actual feel of the original game, I'm concerned that these little changes might remove that fear and sense of despair from that game.

As I've said before, I think, unintentional or intentionally, having Issac as a mute protagonist in the first game added to the feel and made sense that he was nearly holding on and was not talking to reduce interactions to make it easier to pretend he wasn't there. From second game onwards him talking then made sense since he found out that the terror never left him.