After taking over the high score board, I find myself desiring more high scores. As such I request we implement more games. =P
My suggestions based on skimming through the choices:
1-i (might be fun from what I played)
3D Worm (played it briefly, seemed interesting)
Blaze Ball (played it briefly, seemed hard)
Breakout
I wouldn't mind Extreme Pinball and Mario Tetris, but we already have variants of those games, so I wouldn't be super bummed if we didn't get them.