@mento: That certainly sounds like a case where companies should be merged into one page, but I am not very familiar with them other than seeing them on pages in this wiki.
There are so many obscure games in the wiki that are completely empty, so I will always try to add at the very least a quick overview just so that the page doesn't just sit empty. It is especially sad when it is a game that is featured in a video since that used to mean that people would fill in the page, but that doesn't seem to happen much anymore.
I think 100% that games, especially handheld versions that differ completely in the gameplay should be split. It especially should happen now that games show their platform when searching. I can see if the game just has worse graphics or some things cut/changed around, but if it is a different kind of game or most of it is different it should be split. This is something that puts us behind other wiki sites I feel.