Technical note: On some high-refresh-rate displays (such as 120Hz or 144Hz), the bird’s horizontal movement may run faster than intended, which can make the Chapter 10 secret route significantly harder. This is a frame-rate-related issue rather than the intended difficulty, and I plan to correct it in a future update. If you encounter this, switching the display to 60Hz may help.
It'll be fixed in the post-jam version!