One of those games that get little attention (matly because the developer is quite niche), it's a shooter that involves virus and parasites. Did I meantion that the virus and parasites look like the real deal?

Stop the deadly Nanostray virus from spreading and contaminating civilization in Nano Assault, a fast-paced action shooter set within a visually stunning cellular system that leaps off the screen in full 3D.  Control your microscopic Nanite ship inside the dangerous virus to fight off infections, navigate through alien cell clusters, battle bosses, and ultimately analyze and destroy the virus' core to save humanity.

http://www.majescoentertainment.com/games/nintendo-3ds/nano-assault/

Well, at least the backgrounds look interesting. 

bottom pick looks like a ship flying over  a mutant testicle.

they're calling the virus Nanostray?

What an odd choice... I guess they're going for brand recognition. Either way Shinen' rarely disappoint when it comes to this genre (Iridian, Iridian 2, Iridian 3D, Nanostray, Nanostray 2).

I want to say it's somthing else but the background is only pointing to what you said...V_V

Nope, this's how testicles look at a celular level:

This looks like it's taking advantage of the 3DS's advanced shaders.

Reminds me of an animated show way way back.

nanostray 1 & 2 were great, so day 1 purchase here, no doubts...

Looks like the guys at Shin'en know how to make a good use of the hardware.