As I know there are no dumped roms of this so MESS will not help I thik but some similar games are avilable.And what about handhelds from USSR , they have some similar to nintendo game and watches and some unique ones for example "Elektronika IM-12" Winnie the Pooh

http://sfrolov.livejournal.com/153115.html (unfortunatly can not find any information in english)