Hey Stewart!
For some reason I didn't receive a notification when you posted, and I was on holidays until this week so I haven't been checking in on the forum.
The game is not currently playable, though I am on the road towards making it so.
I was making a lot of progress in Unity, and the game was in a playable state (though with limited functionality), until I started to implement a modding system (in Unity). It may seem very early to be implementing modding, but in reality modding is extremely difficult to add after a game has been released.
The issue was that loading models and textures dynamically into Unity caused it to become unstable, with random crashes (maybe a 1 in 10 chance of it crashing during a play session). I had had plenty of issues with Unity prior to that, but had found ways around those. There was no "cure" for the instability, I do not have access to Unity's code in order to find the problem, and I cannot abide instability in Universe or Nothing.
That led to the switch to Xenko, a much more modern engine with fantastic features and full source code access. Porting the code from Unity to Xenko went well, but I had to write a lot of systems which Unity provided that Xenko doesn't. Still, while I am not as advanced as I hoped to be the game itself is in the best condition it has ever been. I am really excited about the advances I have planned for the next few months.
Thanks!
Mark