Instructions:

Guide a flock of migratory birds on their long journey north.

Change formation on the fly to avoid danger, recover energy and survive predators.

Head north and save as many birds as possible.

Manage your energy

The birds die one by one if you run out of energy

You can recover energy with lightning bolts

V-shaped formation does not consume energy

Avoid dangers

Clouds kill the birds

Predators kill the birds

But compact formation kill the predators

Become bigger

Gain new birds along your journey and try to keep as many birds as possible to the north.

Tips

The V-shaped formation allows to move quickly without losing energy.

The compact formation allows to easily avoid obstacles and repel predators.

The other formations are unusefull I think.

Stay on V formation as long as you can and switch to compact formation only to avoid obstacles or kill predators.

Controls:

zqsd / directional arrows: move

C: compact formation

V: V formation 

B: vertical formation (not very usefull I think)

N: horizontal formation (not very usefull I think)

P: pause

Assets:

https://ma9ici4n.itch.io/pixel-art-bird-16x16
https://rmazanek.itch.io/bird
https://free-game-assets.itch.io/free-nature-pixel-backgrounds-for-games
https://free-game-assets.itch.io/nature-landscapes-free-pixel-art