Sorry, it isn't at the moment. At some point i can probably make a non steam version, but it wont be for a while yet, as you're the only person who has asked at the moment.
During EA it's also probably easier for me to maintain just the one version on Steam. Current EA version also has Steam cloud save support and am looking to add, Steam Leaderboards and Workshop support. Obviously a full version here wouldn't support any of that.
