I played your game three times- the first time, when it had a different controls (with triangle and circle). The second time right now. The third time also now, but to claim the first place on the leaderboard :)
The game reminded me of "a bit lost" (if my memory is right it's more or less for your son's age), which is also about a baby owl that fell out of the nest. This is a cool use of the theme that gave me all kinds of warm feelings :) Also- I love the name Owlfred!
The graphics and sound are pretty much what I'd expect from this team. As usual- any game with voice acting gets points in my book!
As for the gameplay. It's a good idea, but I think it needs some balance. The early version was a bit difficult- when you are in a hurry sometimes your tringles get a bit rounded and circles get angles. This version is way easier. Drawing lines is almost as easy as controling Owlfred with a mouse. The thing is, the early version made sense in context. Flying is difficult for a baby owl, and the controls sold that feeling.
In the end- this is really impressive for a game made in 18 hours! I'd say something like "keep up the good work", but you're already doing that :)