It's been on Steam and on the ZOOM Platform for years!
Why isn't it on GOG?!
Come on, GOG team, make it happen! =D
It's from the same creators as Enclave (which is on GOG), and uses the same engine.
Unfortunately, the second installment was developed by Cauldron, which used a different engine... Overall, it's not as good a game compared to the first entry. =/