Definitely needs to be made into a full game. I would say this has a lot of potential. Please don't make it TOO gamey though if you know what I mean; it's a great experience and its simplicity is most of its charm.
I'd have to rate this a 2/5. Though far from original, Nano wars for example has the best and simplest execution of this idea. A screen too large to display all at once is a big pain as is not being able to move multiple groups. I've played Nano Wars for hours on end, this game however leaves me cold after a few levels.
I really enjoyed this game :) Very atmospheric mediaeval music. I almost gave up trying to figure how to do the actual jousting part but am glad I didn't.
Richard Garfield 'Magic The Gathering'