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On desura free until end of month.

You can currently download it for free from 5 sources and have it permanently linked to your account, form the same sources. The others only offer a DRM-free download. Once the download is lost, you would have to buy the game.

Permanent registration to account with: Desura, Shinyloot, Indievania, Amazon, Indiecity.

Developers website, free DRM-free only Direct link download (limited time offer) after that purchase required.
GMG will sell you the game, even during the developer giveaway.