We put this version on sale just to get some exposure. You can grab the Earlybird deal on the KS Campaign right now for $15, and get the full version when its ready (Steam/DRM-free PC & Mac & Linux) plus some Kickstarter goodies!
so if someone had bought this at full price, they wouldn't be getting anything in the future (if so, maybe put a disclaimer on the page)
This version is a demo and will remain 100% off forever :)