[Rev-Share] Sprite artist needed for a Zombie Shooter game (2d)

Hi.
I am creating a simple 2D zombie shooter (Mix of L4D, and Broforce), and I am looking for a sprite artist.
The game concept is simple:
- Kill zombies (Few kinds of zombies. Stupid walkers, jumpers, splitters, chargers, wall crawlers, throwers etc.
- Push forward
- Play with friend (on one PC)
- Play with friends over internet

I want to create a prototype, publish it for free as DEMO level (15-20 minutes long).
If DEMO will be fun, then we can make more levels and publish it on steam for 5$.

I am a professional C# programmer, so all coding will be on me.