I just wanted to echo some of the comments here. This game is absolutely amazing and I really hope it goes to steam at some point. It's an insta-purchase for me if/when that ever happens.
I see far more reason to support games outside of Steam.
Especially now that Valve have openly declared war on customers with migraines, epilepsy, vertigo and several other conditions. Here, have some interesting reading. It's been closer to 2 years than 1 at this point:
https://steamcommunity.com/groups/SteamClientBeta/discussions/3/2962768084999962...