New vertical cover: Game & Watch - Ball

My only suggestion would be to change the font used for "BALL" on the spine and the top of the front to the same font that was used for Oil Panic and Donkey Kong. Uniformity is pretty important on this site, so keeping the fonts used for the titles of the games the same for all covers would be a definite good idea.
EDIT: I also did a little bit of tinkering to try and fill up the empty space on the cover, and I slapped this together.

This is, by no means, a high-quality edit, or a final project. But, I basically think that single-screened G&W games, like Ball, are better suited for Horizontal covers, in a style like this. Of course, the font still needs to be changed back to the font that was used for Oil Panic and Donkey Kong, but this is just a rough sketch to give you an idea of what I was looking for. I think using a horizontal template for single-screen games, and a vertical template for dual-screen games would be really great. As long as all the spines for both templates are exactly the same, you shouldn't be able to tell the difference when they are lined up on a shelf.