I assumed the game cover would be similar to the cover art or vertical banner in the fansite kit (dragon behind dragonslayer). Something different could be to have a closeup of the dragonslayer's eyes along the very top edge, with the title just below it; the eyes could be (at least partly) between the dragon and sword symbol and the 'II'. The majority of the cover could then be the dragon, casting the shadow of a human. If there is room on the back of the box (or perhaps as a background image), you could have a dragonslayer casting the shadow of a dragon.
I don't know about 'cool', but this would be slightly less cliché than a mirror or split face design, anyway.
