Credits

Unless noted below, all code, art, etc by David Blood.

Code

• The JawsJS game library does the heavy lifting.
• The box2dweb library handles the physics.

Art

• Character sprites and animations (Tommy Utah, Zombies, Aliens) by Chris Hildenbrand
• Fire, electricity, blood, gun flashes, etc by POW Studios
• Spinning coins by Clint Bellanger for Liberated Pixel Art
• Blue starfield backgrounds by webtreats

Sound Effects

• Throw "swish" sound effect by artisticdude
• Footstep and landing sounds by Jack Menhorn
• Snore sounds by matt

Misc

• Levels created with the excellent Tiled Map Editor

Most (but not all) of the above are available under various open / free licenses. See the linked webpages for details.

Also note that some of the art & sounds are temporary and my be replaced in the final release.