The above trailer is for a game called Capsized, which is in development for Xbox Live Arcade. It looks like a rollicking good time. Gorgeous art design, platforming and lots of shooting.
It might just be the bits with the light, but I'm getting a real Metroid vibe from all of this for some reason. Maybe it's the bizarre creatures and landscapes or the level design which seems to have a lot of up, down and all around to it. Either way, sign me up. This looks like a blast.