I just downloaded it and had a quick go of it by myself..
One of the things that i think you guys should modify is part of the movement. When you hold up, left, right or down.. You start moving of course, but when you let go you -instantly- stop. I think you should sort of, "slide-halt" into it, so you dont stop instantly but more gradually.
The graphics looked good, and i really liked the music. When i ran into the ship, my ship dissapeared, and then it took a second before the explosion came, so it seemed a little bit late.
Besides those, everything seemed pretty cool
WindowsXP Home(Service pack 2), Athlon XP 2400+(2.1Ghz), 1GIG Ram, Ati Radeon 9800Pro 128MB.