Wow, this is downright wonderful, possibly my favourite entry from the jam.
The take on the theme is great. The core gameplay loop is lovely and even though I though at first the formations are useless until I've tried again and got a bigger flock meaning it works as an optional higher difficulty. The visuals and audio is just great and the whole thing is a super-chill, fun, cohesive package of perfect jam-game length.
My only nitpick was mentioned in the comment below - I kept forgetting/not realising the mountains were obstacles.
