D-Pad Studio has announced that the PC demo for Owlboy is available, directly from the official site.
According to the developer, "The demo starts off right after the pirates have attacked Otus's home village, Vellie. Otus and Geddy are approaching the 'Owl Temple', in order to find the 'Wind Machine', which will help prevent another pirate attack."
The file can be downloaded here. Owlboy will be released on PC and Xbox 360 later this year.