Love it Love it LOVE IT
This DS version might lack the punch of the PSP version's dizzyingly awesome optical-disc based soundtrack, but makes up for it with a 2-screened truer representation of Space Invaders gameplay - especially during boss battles - a stronger multiplayer component and generally more extras than the PSP (truth be told though, both versions are brilliant).
Whilst the music based gameplay germinated from an idea originally featured in the somewhat forgettable PSP shooter Space Invaders Revolution (aka Space Invaders Galaxy Beat), here it is fully embellished in the most explosive fashion. !Magnifico!