That was really fun to play ! :D
i was able to beat the final Boss (the father ! xd)
i love the art style, and the sound effects, reminds me of the game cup head ! :3
Though i noticed that if you jump while moving directly into a wall, the bird will get stuck on that wall.
And if you died fighting the final boss, but your clones killed the boss, the game will spawn hundreds of robot birds and get you a massive lag for a few seconds, till the game clear the area, and you won't be able to replay the game as well because of the lag (require refreshing the browser page).
Not a big deal but worth mentioning :3
Overall, great job !