I enjoyed playing this, the control system worked really well (I used the point & thrust scheme) and it had the feel of some old-school space shooters. The visual style and music worked very well together, and I liked the way pickups would orbit you once or twice before being vacuumed up.
My only problem was that I wasn't able to finish, I was in the last (I think) stage with everything upgraded to level 4, but when I got killed I respawned in a small gap in the walls so I wasn't able to move.