We may have Mac & Linux versions of Murder Miners 1 on the way. We have a dev working on that now and it looks like it's doable so far. We have basic cross-platform multiplayer working. Hopefully there won't be any huge technical hurdles that murder the project's feasibility.
Murder Miners X status
In our last post we said we started a new build for MMX. That doesn't mean all previous progress was lost. It just means the core of the game is being re-done, and we'll be able to easily add back in what was on top of that core from the previous build. As for recruiting help, our plan has been to get the alpha out and then with that we'll be able to attract the best possible talent to join the dev team. Unfortunately it's taking much longer than expected to get to that point :/