It is incorrect to describe this game as a melange of Celeste ↗ and Gris ↗ because of course this game predates both of them. But that is where my mind went — this sort of "emotional platformer" — and this game is terrific, ten hours of beauty and challenge and fun and very sweet characterization.
I think the gameplay was a little less tight than Celeste; I think the exploration and non-linearity felt a little unsatisfying (and I barely scratched the surface, it seems). But it was an absolute treasure of an experience, and I'm excited to dive into the sequel soon.