Amazing visuals, I would definitely love to learn how you achieved this visual style! The gameplay is good, it's a neat momentum platformer and the levels are a lot harder than the cute visuals would have suggested :p I ended up giving up I think 8 or so levels in, but enjoyed my time playing!
One thing I felt was really important later on was timing the angle of when you let go. The level where you had to cross a really wide and tall gap with a single feather really demonstrated this since you want a combination of vertical and forward momentum. However, I think the pseudo first-person view made this really hard to judge and I wonder if doing a 3rd person view that's centered on the anchored bird but can rotate around would have helped. The way the game currently is I just had to roughly time how long I fall and how long I've spent tethered before letting go.
Anyways, this was a very impressive jam game!