Not really clear if this is just a rental.

It is purchasable in Google Play as well as rentable. Maybe you guys should add the option to own.

i´m from Germany and it´s not available here.

How about subtitles or audio? )

It's now available for purchase. Good quality stream. A rental will sit in the video portion of your library for 30 days until you begin to stream. After that, there's a 2 day limit to the video. If purchased it's still streamable only. Also f you rent it, it obviously won't show up in your Steam community game list but if purchased, it's there. EDIT: Just wanted to say thanks for making this available to purchase finally. Bought both rental & actual purchase to test out those couple of things + show so...