two very minor bugs:

[InfyD]

1) the mouse cursor sometimes disappears, possibly after switching to another window then back.

2) I earned the achievement "Learner" without doing either the build your own solar system or the launch asteroids at Earth tutorials.

[Rogersdead]

I earned the achievement "Learner" without doing either the build your own solar system or the launch asteroids at Earth tutorials.

It says do 5 of the tutorials, not all of them.

[Dan Dixon]

Does the mouse cursor ever come back?

It's designed to disappear after a few moments of inactivity if the window is set to full screen, but then reappear if you move it.