Hey,
as we've been writing in our FAQ, the current online-only build is just the first step for Curious Expedition. We'll release regular downloadable versions in the coming weeks too and we would also love to be on Steam. For that we need your help getting through the greenlight process. Please give us a yes-vote here:
http://steamcommunity.com/sharedfiles/f ... /370469553
All buyers of the alpha version will also get the Steam version for free of course.
Thank you!