Dodge the pipes.
After playing for 15 minutes straight and getting to lv 04 / ??, I am able to find alot of problems:
1.firstly the collision polygons for the bird need to be fixed (From beak to back of body to wings, may remove polygons from tail feathers.)
2. No sudden level changes
3.1 frame makes the bird look laggy, recheck frame, a frame is being used twice in a row thus it looks crude.
Other than that, nice job on your first release, it is indeed a working game.