It works in frameworks like Unity Engine, but otherwise it ends up like Space Engineers Windows-only which is a shame.
There are some other frameworks that use C# and are cross-platform. Monogame is the cross-platform replacement for MS's XNA, which targets most of the major game systems out there.
Yes, I understand that Windows is big and there are a lot of C# developers/fans here who immediately scream "What? C# can do anything!!!", but in practice MS doesn't support opensource where it matters and when it matters.