Same here, I have been playing Faucet Birds for roughly a month. I have 15 refs, 5 king birds, 7 green birds and a withdrawal balance that can't be cashed out: 318664.43 satoshi.
I have tried smaller amounts like 5000, 10000, ... but no chance. Say that my XAPO account works perfectly and I can cash out from other faucet /games) with no problem. The email used when registering to game matches perfectly with the one used in XAPO.

After reading the experiences from other users here, I am quite discouraged regarding the game, and of course I would not recommend to invest in it.

Contacted the support email, but according to what I read in the thread I guess it is a waste of time :/