I don't know about Metal Arms (never played it), but you're right about the Pac-Man party game, Bean Bunny. It's actually named Pac-Man Fever, though.
Mass Media has done ports of PS2 games from Namco to other consoles, as well as developing the newer Namco Museum games for the new consoles and GBA. They also did Pac-Man Collection on GBA.
I also reviewed Shrek Super Party a while back. Mass Media is no stranger to the party board game genre, as they also did that game for TDK. Unfortunately, that game wasn't very good. Luckily, Muppet Party Cruise is much much much much much much much better.
I kind of feel that Mass Media's games they develop are hit or miss, but I can tell that they at least try as hard as they can.
--Klonoa
If anyone has any Pac-Man questions, ask me!