I noticed that most of the Gowin games known to be released in English are either in color, or appear to have had color added to them.
Based on Gowin's site the list of English games was GS16, GS15, GS13, GS12, GS11, GS10, GS09, GS05, and possibly Crouching Tiger (which I think is GS17) but I don't know if that one ever got released. This list seems to match up with Crystal Interactive's site.
Not too long ago though, I found an archived listing for an English copy of GS02 (Magic Ball) on a Polish shopping website. The copyright dates on the box suggest that the game was sold in the mid to early 90s. That too my knowledge is before the first color Gowin game was made. This means that in addition to the known set of English Gowin games that were sold by Crystal Interactive there was an older set of what were probably most of Gowin's mono games.
Link to Archived Gowin Site:
https://web.archive.org/web/20020428082456/http://gowingame.com.tw:80/english/0001.gifLink to Archived Polish Listing:
https://archiwum.allegro.pl/oferta/magic-ball-na-game-boy-rarytas-i7168766474.html