Firstly, the difficulty, everyone says it's too hard

Boot up literally any Chinese fangame, your argument is now invalid.
Jokes aside, I think it's not as hard as people make it out to be and I'd say it's actually kind of fun and challenging.

Secondly, everyone says phase one is too close to the OG game

That's the point, it's supposed to feel like the original sans fight, it's not supposed to feel like a fangame until the later phases.

And thirdly... I can't think of a third thing, in fact I'd like to hear everyone who disagrees with me tell me their third thing.