You have promise.
The graphics of the people,buildings, those walking machines and the effects were a bit scetchy by standard.
The snow was done well and the background ect.
Good style and character.
Sound effects would have been good...but dulled a bit because the lack of sound effects added an element.
Violence idea was good but was displayed in a manner that you will improve over time.
Good start for a first flash presentation. You'll get there.