I think you need to reconsider your scoring system a little.  It really needs a miscellaneous category, as this would include stuff like ease of installation, user friendliness, and not having hundreds of files on the calculator like Contra (well, maybe not that many).  People often underestimate the value of these things in a game.

I've got an idea for an entry.  I'm thinking Contra 83, but less abusable, more varied, and not so luck-based.