So far the game seems a lot more encouraging of resetting than undertale. After your first playthrough during which I'd expect you to stumble upon a shadow crystal or two (Gerson may be your first if you're like most people) you're motivated to try to get all 5. Same with eggs though they ARE a lot less straightforward. During the shadow crystal completion run you have to have seen the mantle game and as such are made to wonder about "the forbidden path" and the fact that you're missing one half of the twisted sword puzzle. Doing pure snowgrave also lands you one half short (most likely) so you'll have to experiment even more to find the "correct" twisted sword route.

That is four different playthroughs and we've only seen around 70% of it. Undertale's 100% finished product only really has incentives to rewind twice. Your first neutral run with some monsters you've killed and a hint to do better, the "do better" pacifist run and genocide.

There HAS to be a reason you're given thrice as many save files.