Probably like the third time I've gotten a little carried away and accidentally hit the X in the corner while playing. Poof, game goes away. Is there a way to force fullscreen I'm not aware of? Alt-Enter doesn't do anything for me.
Not at this time, no. A full screen mode is coming, but we haven't gotten to it yet. I know some people have been using some borderless windowed fullscreen programs that can force games that don't have an option for it, but we do plan on supporting that option eventually.