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I think you have a different concept with the whole horizontal navigation thing. However, even though I like rough style illustration (when you don't mind as an artist whether elements look slick and neat) this is too like a "school playground" drawing.
I don't know if that's what it is supposed to be like but if you like it thats all that matters I guess :)
You could do with more space filling content as there isn't much happening. In fact some content could be put together on one page rather than spread over many.

Actually, this is the style that i had in mind when i started the design in photoshop.
I do agree about the space filling part, there is too much free space, i tried some things, but it's hard to fill it up and still keep it clean and neat.
But i'm working on it