Really good, but in the long run it becomes boring
If you are up to making it complete, I would suggest to not add too many levels.
If you look the map, it seems like there are over 20 more levels to come. Considering that only one level can take hours and hours, the whole game would take at least weeks to complete, not even months.
As for computer games, it should be nice and simple few hours fun. Then the player wants already something new. Too long computer games, is just plain boring.
Btw, I also noticed one minor fun glitch.
In the 5th level, make your chicken fly to the small hole at up right in the starting point. (Under the statue platform ground) The chicken gets stuck. Really amusing :)