I'm genuinely surprised that this game didn't get as much attention as the first Celeste game, not just because of the fact that this has the "Celeste" name attached to it but because it was an extremely amazing platformer.
Starting off, I was originally under the impression that this game was going to have you play through parts of the Celeste game (non-pico version) as it starts you off with the tutorial level. It immediately takes a change as the bridge from Celeste breaks, and Lani ends up falling down the mountain. While you can't dash in this game, you gain access to a grappling hook that will be the main source of movement; at first, the grappling hook feels like it delivers very little in momentum other than sideways, but it very quickly becomes apparent that combining the hook with jumps allows the player to string movement combos that feel rewarding to do. Just like in the first Celeste game, each screen has been tailored to teaching the player how to string movement together, and it all comes together on the last couple of screens where, aside from knowledge, the platforming because faster paced and reactionary.
After having run through this game twice (OBS crashed my first run-through), I couldn't find any glitches, bugs, or any sore points in the game. While it did feel short (it's a pico game, wasn't expecting it to be too long), the difficulty felt balanced and progressive in a way that didn't ever feel like it was too difficult.
All in all, Celeste 2 needs a full release. Celeste is my all-time favorite platformer and knowing that there is a possibility that this game can have a continuation with newer game mechanics is the most exciting news I've had in a while (Yes, this pico game came out a year ago, but there's still a chance)
My playthrough: