Here's a part of a Modojo interview with Roger Carpenter, Sierra Entertainment's producer for the game Geometry Wars: Galaxies for Wii:
MO: The Wii version offers connectivity with the Nintendo DS in downloading a trial version of the game for the system. Is this a first, as far as you know?
RC: Yeah, you can download a full version of Geometry Wars: Retro Evolved to your DS (and the DS version can do the same to another DS). As far as we know, no one else has done this before, it’s very cool.
MO: The original title was praised for it’s purity in terms of features as much as it’s frantic fast paced action. Was a lot of restraint required when designing new mechanics for a packaged release? How was the balance struck between expanding a $5 game into a $30-40 one, without mucking up the formula?
RC: There was no question the formula had to be kept. It was about adding a few new big twists to enable the depth of game to exist (Geoms and Drone) whilst also adding to the familiar formula in other ways (grid shapes and enemies). We’ve always been very aware that there’s a big perception gap between $5 and $30-40, but there’s never been any shortage of cool ideas to allow Kuju to create a massively bigger game within the formula. The DS version hasn’t had be a poor cousin in the process either, it’s going to get more multiplayer action than the Wii version!
Full Interview Here