Chester is a 2D platformer with over 10 unlockable characters, a light RPG element and leveling up system, loads of unlockables, around 50 levels, and 8 "styles" that allow the player to change the look of the game at will. These styles include sketchbook, 8-bit, LCD, blueprints, and many more. They also each give a unique gameplay bonus to the player. The game also includes 4 difficulty levels so that almost anyone can beat the game or get a very challenging experience out of it.
Just a quick runthrough of the Chester United Weekly(ish) Demo 2. You can find the demo on the downloads page.
Note that this is a preview of the upcoming overhaul Chester United and is not gameplay from the currently available Chester.
Purchase of Chester WILL give you a copy of Chester United once it is released.