In fact, that's what I'm trying to find more than the game itself. It's an old DOS game, sort of an action-puzzle where you control a ship that moves around the edge of the play field, and try to move a ball in the center into a goal while avoiding traps, etc. I
believe it's called "Cannonade" or something similar; I used to have it but lost the disk a long time ago.
Much obliged if anyone knows what I'm talking about!