At the current state there is still a lot of work to do. Mainly the ingame menues have to be redone for the small resolution of GCW0
Well, there is another lazy way but here's what you can do :
Since the GCW Zero can downscale games with hardware acceleration using the IPU,
set the resolution to 480x360. (i see that your game is using a 640x480 with black bars so remove those black bars)
Then, simply add this line to your desktop file :
Tada, no need to redesign the game.
(Yeah i know, it will look blurry and all but that's still better than a console with no games)
Sadly I don't own a GCW0 At the moment but I will try to change this as soon as my financials allow this.
If you don't own a GCW Zero, then you can give this a shot :http://www.gcw-zero.com/news.php?id=13
Also, i need to mention : those graphics are terrible.
It needs more anime.