I feel as though I were conned.
I was expecting an amazing stick animation, the begging was great! I liked it much! Then, suddenly, the art style changes. It becomes less detailed. Likely to save time. I really must say I am disappointed you didn't let the entire flash stay with the art detail and style. The backgrounds also started to lower in quality toward the middle of the flash. Then when he enters the room with the dog, the background looks really good again.
The lighting was one of the largest changes I noticed, it changed the same time the art did. The scene before the main character leaves the building. It comes back at the last scene as the main character enters another building.
Al in all, I still gave it an 8/10. It was fluent, that is very true and made it worth the watch. I hope to see more, just in the style used at the beginning or end.