While it may seem like a pain in the ass, why not write it down, take a pic w/ your phone, etc.. and then have a Hi-Score menu WITHIN mGalaxy itself. Bring it up like any other menu. Show the Logo artwork, current Hi-Score, click to see Top 5, 10, 20, or whatever. Click to type in a score and name. Basic stuff I'd imagine.

Maybe even show the current hi-score as you scroll through the menu of games. I know home arcade owners have little pieces of paper they put in the marquee to let friends or people over for a party to see the score to beat, because they reset their games from time to time.
I think this would be a great addition for personal bests, or for parties, families, etc.. as well.
Maybe even allow the menu to be brought up while in a game too?