art and music was great, overall great concept. some constructive feedback would be the following.
my first play i didn't see the bird i was controlling, it was very small. i like the fact the camera pans in when going lower. for the life of me though i couldn't figure out what to grab on the citizens, there is a sparkle effect in the beginning but that was it. i was able to get it after the third or fourth play. the increase in gravity was harsh but what was worse was the collision with other citizens.
i managed to grab a treasure and fly back over the roof tops but when the timer ended my character died and i did not receive the treasure . as I am writing this i just played it again, so you have to go all the way up to the sky with a treasure.
my suggestions would be to utilize that pan in and pan out feature when the level starts, to draw more focus on the bird, add a eye catching thing to the collectibles, and maybe an indicator on where to go once you have the treasure