Why is the Linux version of this game not on GOG? Numerous other games, such as Hotline Miami and Blood have Linux versions available here.

It arrived on GOG before Linux was supported. GOG needs to reopen its distribution agreement with the Publisher first.

Thanks.

I second that.

Could it be possible to extend the "Redeem on steam" operation to those games too ?

I have a Linux machine now, and basically most of my GOG collection is useless although most game have been ported to Linux. This is so sad :-(

I've been relying on PlayOnLinux installs, but I also have a Windows dual boot.