Great game! The bittersweet aspect of the game is interesting, the contrast is well marked. The atmosphere is soft but melancholic, both visually and with the music. The game is quite cruel in its difficulty, but with perseverance and belief in yourself, you'll get there in the end! haha. The link between the difficulty and the little words of encouragement is amusing. I also like the evolving palette, which allows the atmosphere of the game to evolve in a minimalist and effective way. The handling is simple and effective, and the level design is very well crafted to take advantage of the gameplay.
I'd just like to make a few suggestions: a more progressive difficulty, a tutorial aspect would be nice. The camera is sometimes a little slow to follow the character in certain fast passages. Perhaps some specific framing could make the game easier (you can't see certain platforms below in certain passages). And the peaks aren't visible enough, they're too pale.
In any case, it was fun to play, and it helps you work on your perseverance and patience! haha Thanks for the game.