it is on steam to where you can wishlist it, but is not available for purchase, yet. that may be awaiting completion, or at least a couple more chapters being finished. just depends on how and when digi-b wants to upload it to steam, for release there. it's likely just waiting on reaching a certain point of completion, so there are fewer DLC chapters to add, and possibly on the ability to reach an agreeable deal with steam/valve, for pricing and such.