Agreed, this is one touching movie!
It reminds me of the legendary NG toon "From My Room," in a way. Newgrounds could use some more of these! Always nice to have a good mix of stuff in the Portal.
Some of my critiques (mainly with the graphics) - you may want to try using less thick of lines. If not that, then try experimenting with some of the stylized lines available in Flash - the thick black lines might work if you use some of the more crayony-looking line styles.
What frame rate is that, by the by? 60 FPS? It's great to see someone else using high framerates in their movies too. :D
Excellent work! Keep on flashing! ... Wait... NO! PUT YOUR CLOTHES BACK ON!!