My favorite game so far! It's just beautiful and I love platformers like that. I would just add dynamic gravity so the movement feels better (you can multiply the gravity by 1.5 or 2 when the girl is falling to achieve this). I don't know if the flickering of the tiles are happening to you, but I think it's camera related, even tho I don't know how to solve it in unity.
Also, I don't know if it's a feature or a bug, but it's related to jump buffering (maybe the coyote jump implementation): when you press jump 2x in a small window of time you actually double-jump, this allows you to jump higher and you pass some of the obstacles with this technique :p
Congrats on the game!