very nice Game made extrem fun to Play.
I only have two smal points but these are more my opinion
1: maby make the gravity for the player a litlle bit bigger couse sometimes it fells like you were on the moon or maby thats the felling you wantet to go
2. I think s small tutorial like you made for the red bird(my favorite it makes nice sounds :) ) so you know what or better said that there are doing something
But very very nice Game