Aliens: Colonial Marines is a side scrolling action game (similar to Contra / Metal Slug) that was in development by WayForward Technologies for the Nintendo DS, but the project was later cancelled along with all the other Aliens games that were going to be published by SEGA (a FPS and an RPG for the Xbox 360 / PS3). It seems that SEGA decided to not release the Aliens games for financial troubles.
Thanks to Dark_ViVi and ABetaName for the contribution!
U64 is an archive with articles, screens and videos for cancelled, beta & unseen videogames. Every change & cut creates a different gaming experience: we would like to save some documents about this evolution for curiosity, historic and artistic preservation.