Mouse is hidden on the game screen... ... but does go off the screen (visible normally) and is still active, if I use mousewheel, visual studio (for example) starts scrolling and the like. The black is just that - black - it's like a weird clipping issue I can't really identify or describe correctly, you just turn a fraction and poof - nothing. Move the angle back, and they all pop back into view.
On a plus side, I got a lovely long tail of stars behind me this morning, and they were all chasing and locking into the tail - looked fantastic :) I think this is a play when you want to relax kind of game :)