This game and other games by the same developer are currently available to buy on Steam. If you logged onto Steam and cannot see it, then there is a chance it is blocked in your country for some legal reason.
My comment was maybe made on a bad day for me here, but I think I just noticed asking at some point if you can buy it here, yes I know about the steam situation which is why I probably had written it in the first place.
However someone mentioned something that could hint on there being a change soon, that at least allows us to buy it again.
I swear sometimes you can say your favourite dog is named daisy or something.