Looks like those Taito trademarks pointed us in the right direction. Nintendo put Darius Twin up on Virtual Console today along with lilt line from Bit.Trip maker Gaijin Games.
Darius Twin is a horizontal shooter with selectable zones and many elements from Darius II. There’s a two player mode and (if I remember correctly) only one final stage. Darius Twin is 800 Wii Points ($8).
That’s less than lilt line a WiiWare game Gaijin Games priced at 500 Wii Points ($5). Kris covered lilt line before so you might want to check out his impressions here.