If the porter is still interested in releasing this properly for the GCW Zero, there's a new feature in the 2014-08-20 firmware
that allows you to request a larger video mode in an SDL application (for example, the native resolution of the original game, I believe 480x360?) and have our hardware resize it for you.
Because the native resolution of this game is larger than the LCD screen, the following declaration is needed in the .desktop file:
After adding this declaration, resolutions larger than the LCD screen are allowed.