I'm repeating myself by writing how much I like what I'm seeing here: Really nice visuals, solid programming et cetera et cetera.
Although I would like it even more if it was a single-player game with a story and all that (but never mind).

In your recent video, the rotation of the dust sprites towards the camera is sometimes too obvious IMO. But I guess this can't be fixed. I don't know whether you meant that by "rotating-sprite problem"?

I quite like the explosions. They could be a litte bit more "flashy", though. They look good, but at the moment they look more like Piff! and Paff! than BANG! and BOOM!. The latter might be more satisfying and make you laugh in triumph "Ha, game over for you, dude!" when you trash an opponent's ship. At least I enjoy spectacular enemy deaths.