Antares 0.4.1 has been released. This is a hotfix release, fixing three issues:
Antares 0.4.1 Released
That's better, but there's still a little bit of input lag (unlike 0.3.1). It's not obvious with keyboard input anymore, but you can still see the crosshairs trailing behind the mouse pointer. And I think it's slightly harder to click on ships while the mouse is moving than in 0.3.1.
The game crashed once when I told it to quit. Added to issue tracker. Not exactly a huge problem, but...