Based on an existing Flash game mechanic.
My responsibilty was to come up with a whole totally new identity for the sequel.
This included character designs and animations, artwork for scenery and in-game assets, interface and menu designs/layout, contributing to the game concept, build-assets, sprites, icon design, logo design, all graphics. Liaising with the developers and passed on to coder for build.
Please also see more of this in the Animation section here.