Unfortunately not, Rezsnore. You know, I tend to forget many things - but more or less my description is correct. I didn't invent this game - I clearly remember that I broke a left arrow key while playing it on my Powerbook G4 )

Apparently it didn't feature asteroids - but different kinds of enemies were present in progression from simple to complicated and strong - each with its own weapon, like in Ultraviolet Dawn - only without me fixed in the center of the screen, but instead moving freely in all directions. It also seems to me that most of the enemy ships moved slower than me but they appeared in increased quantities and i had to control my movements so that I'm always safe. And I shot at them certainly. And they shot at me. My weapons upgradable I guess... and armor too. And I vaguely remember this grid on the background... It sort of helped me calculate at what exact place the enemy ship would appear on the opposite side right after crossing the edge of the screen - that was fun and thrill to watch out.