Beulah and the Hundred Birds sees you riding on the back of a bluebird, leading an ever-expanding flock on a pilgrimage to, well... explore.
It was created for the Experimental Gameplay Project under the theme of 100 Things. And yes, at some point you'll have 100 birds gliding along in your wake.
If you like relaxing, peaceful platforming in the vein of Knytt, do check it out.
Beulah and the Hundred Birds [site]