I can safely say that City Defence is one of the most boring games I have ever had the misfortune to come across.
You are asked to defend five cities from a missile attack by firing rockets from one of three bases. You can have up to five rockets in the air at any one time, and you can control the last rocket that you fired, moving it left and right with the TAB and Q keys. The game is split up into rounds, at the end of which you get bonus points for each missile left, and each city remaining intact. You get thirty missiles per round (Three per base), and the game finishes when all your cities are destroyed. You get a bonus city at every 1500 points (if you manage to stay at the keyboard for that long. One (should I say the only) nice touch in this game is that it is BREAK-blocked; in other words only CTRL-BREAK or switching off will remove the game from memory (this is probably the only way they can get people to play it!).
The graphics and sound in this game are barely adequate. I doubt if it would be worthy of publishing in a magazine, let along trying to market it from such a reputable company as Bug-Byte. To sum up this piece of software, it would make good fire-fodder for Winter: a waste of tape!