Hello everyone, and thank you for your interest in Starry Midnight!
As always, it wouldn't be a launch without SOME kind of technical gremlin. For reasons we haven't been able to ascertain, the demo's store page is titled "untitled app demo" and isn't linked to the main store page quite right.
http://store.steampowered.com/app/366820/
You can still find it at the link above, and the demo itself works just fine, so please try it out! We'll have the store entry sorted out as soon as we can.