maximum 600 satoshi's 200 times a day (but you'll have to win each round) + some satoshi's if you directly challange your friends + some satoshi's if you play their other game "coin crush" (payouts are lower).

Basically, you could get as much as 0.0012 from flappy bird by playing the regular game (600 satoshi's * 200) + maybe 0.0004 from coin crusher + direct challenges (just an educated guess)...

In reality, i make 0.0005/day, since i'm addicted to this game