My brother used to play it on the Amiga back then. Should you ever want to play it for inspirational or other reasons (DosBox should get it to work), Here are some tips:
The Dragon light mech can win against heavies like the Titan and Hercules if played skillfully; He can stay between the big guns of the larger mechs, get close and use his flamer to overheat them. Especially effective in lava zones.
The Crossbolt is good as a support mech when besieging a fortress; Let the AI handle it and it will wear down the defensive walls
There are only three mechs you really need in the whole game: The Mercury (3 light lasers) for early game, the Mars (fast and cheap, lightly armored, but has a PPC) which is your work horse and can hold it's own with some cover against long range missiles, and in the end game, when you have resources to spare, the Titan (or Achilles/Hercules for a cheaper alternative).
The large center city (titania or whatever it's called) provides a big amount of Credits each round, but it will be attacked almost every turn, sometimes multiple times, so large parts of it will lie in ruins, reducing it's output. It repairs itself, as all cities do, over time, though.