Not bad at all! The Sketch look like from the level artist sketchbook when i looked at some.
However... to make a fan game you will need more workers on the project and sadly i don't have a hoard of gold and gems to finance it I always see games that are WIP and some have great potential, like SWTOR had until they installed a lame patch that replaces all of the good sounds with toy sounds and ect. >_>
I wish the best of luck to create at least the alpha version of the game I will be waiting for it eagerly.