Very beautiful game, and I love the intro. I love games that just drop you into a world, no context at all, and leave you to figure things out yourself! And the lack of the color green makes the world feel lifeless and decrepit – it reminds me a lot of Hollow Knight's absence of the color red.
My only major complaint really is that the jump feels unresponsive at times. Especially during some platforming parts, the game wouldn't register my jump once I landed. Whenever I make platformers, I always like to tie the jumping to a buffer instead of a raw input (and the input itself just sets the buffer), so the game can register that I want to jump just before I've hit the ground and do it when I land.
Really nicely done, though! Great work!