See: Rowr's Let's Play! thread.

Iji is the story of a girl who was experimented upon to use nanomachines to fight against an invading race of aliens. Iji being the main character, a young girl suddenly weighed with a "save the world" mantra, to whom moments ago the world had been a peaceful place where no one had died, when in reality she had actually been asleep for 6 months with a war going on outside.

There's a lot of backstory that helps support the game, based on the first five levels I've played more and more information, monsters, music, and shooting fun pop up at me making this appear to be so far a very fun game to play. The initial story is surprisingly well done. Despite the obvious anti-immersive science fiction and overall simplistic art design, human emotion factors in quite well and caught me mostly off-guard when I was expecting a very simplistic shooter.

The gameplay is mostly a platforming shooter. You can upgrade weapons by acquiring nanomachines by defeating enemies. Enemies that you can understand because of your nanomachines, and a conflict exists between your character's morals and the fact that she has to kill to survive, which creates an interesting dynamic, yet has no real effect on gameplay, which is very much a blow everything to hell approach. Once enough nanomachines are collected the player levels up and can upgrade various stats at various stat stations. If the player upgrades an alien weapon stat three times they can hold newer weapons of alien types, but that creates a conflict because there are so may other things the player could choose to upgrade which makes for some strategy.

I'm looking forward to beating this game, and you should try it out.