Oh boy, reading comments like this hurts me even more for neglecting this game :'(
It's a little bit of both, really. Work and other obligations take way too much of my time.
But what I am working on now is also part of the reason. Rewriting the multiplayer mechanism keeps proving to be way harder than I expected. I am scouring my code for parts that I must rewrite, testing my changes is tough, mistakes are hard to debug, and I am essentially at a point where I feel I am re-doing old work in a more complex way, only to have moderate satisfaction when I'm done. All this takes away the fun part in developing the game.
Obviously, the game is not "abandoned". What I intend to do, is to finish up all the stuff I've started so far (no starting on new features anymore), publish a cumulative update, and then take a much needed break from SV to work on other projects. I am considering cleaning the code and putting it on GitHub, so maybe other people will contribute on the game too.
TL;DR game is not abandoned, but progressing really slow.
Sorry to keep you guys waiting, and thank you for sticking along. Your feedback is really what keeps me working on the game.