Brain In My Head (Steam key).

http://store.steampowered.com/app/566220/
A nice little casual arcade about zombie murdering
Brain In My Head is a funny casual arcade shooter with stylish graphics.
Kill hordes of zombies and have fun!
It´s about killing all of them!
Kill waves of zombies to get a chance for Boss Fight. Use powerful weapons, player and stage abilities to gain maximum damage!
Get rid of your free time in a funny time killer!
Weapons have two fire modes. Be creative with your murders - watch zombies fall underground, burn them or make a bang!
Wireframe shadered game with cartoon graphics
Brain In My Head is shipped with truly indie game graphics, experimental art and design!
Try to relax and enjoy killing!