Stick Man Zombietron is a twin stick shooter with Stick Man Zombies.

I'm using Sneakyinput for the virtual joysticks.  You can download it from here:

https://github.com/sneakyness/SneakyInput

There's a tutorial on using SneakyInput here:

http://www.qcmat.com/sneakyinput-joystick-dpad-and-buttons-for-cocos2d/

I actually used a tutorial app as well, but I can't find where I downloaded it from!

Watch out, as there are two different versions - one for Cocos2d 0.99 and one for 2.0.

Remember, you'll need to enable multi-touch in your app delegate if you want more than one input: