It's a really neat idea, and the graphics are really nice. I wish there was some sort of indicator for how many birds to find, or some way to at least know where to look. At times it was frustrating slowly looking around, finding nothing.
I have an idea for adding move speed for each one found and I couldn't solve for playing the victory music in the proper spot as a queue for finding them all. Maybe it's too subtle. Saying "Find #" and having an indicator is probably the way to go. Thanks for the feedback.