It doesn't make sense because it has no meaning (that we can discern). Take Zero Mission, or Prime, for example. The names have an obvious meaning, and require no further explanation. If you're making a game - Other M - and the title is deliberately unrelated to anything obvious, you'd expect an in-game epiphany, explaining how 'Other M' is linked to the story or game. Other M does nothing, and you end up with the same sense of 'whatthefook' as when you started.