The demo version is an unlimited time, limited area sample of NEO Scavenger's gameplay. It includes the opening encounter, and a subset of items, creatures, and crafting recipes from the full version.

The full version has the following additions:

Save games - You can save and quit at any time, to resume later.
Full Map - No limits on map exploration.
More Items - More item types and loot variety.
More Crafting - Wider range of recipes for crafting.
Detroit - Access to a major city, with services and encounters.
Markets - Places to buy and sell supplies.
More Encounters - More events like the cryo facility opening encounter (currently about ~12 as big or bigger than cryo, and ~100 mini encounters)
Hacking - Hardware and software loot can be mined for data. Some valuable, others humorous, some historical.
Full Soundtrack - The game has a dozen beautiful tracks that play intermittently, composed by Josh Culler. Customers can also download the soundtrack as high-quality mp3s.

Going forward, my plan is to focus on fixing bugs and improving modding support in the full version, while the demo remains feature/content frozen. The demo will continue to get bug fixes, UI enhancements, and balancing, however.

Looking for other ways to support NEO Scavenger? Help out by spreading the word! Tell your friends!