It was an immensely deep game, with a wicked anti-copy system where you had to enter a code to warp to another star system. If you entered the wrong code, after a certain length of time, the Space Police came looking for you and destroyed your ship for using an illegal copy of the game. Thankfully, I bought mine from a jumble sale.
Ocean Software and Digital Image Design have a number of great games under their collective belts. One memorable DOS game is Epic, an immense space shooter with a fantastic story and beautifully rendered graphics. 1e1e36bf2d