
1) Strategy First game 2) Windows game
Found on
https://www.crosswordclues.com/clue/gun-metal
[video game] PC PC ==Gameplay== Gun Metal allows players to pilot a futuristic mech which can transform into a plane. The game is based around a war (sometime in the future) on a planet called Helios, where humans have settled. Enemy spacecraft have followed them from Earth and are attempting to exterminate the colony. Project Gunmetal is a...
Found on
http://en.wikipedia.org/wiki/Gun_Metal_(video_game)

Gun metal is an alloy of 90 copper to 10 tin (or sometimes zinc rather than tin or sometimes less copper and a small amount of zinc). It is a typical bronze, formerly used for making cannons (whence it gets its name) and is still used for bearings and other parts that require a high resistance to wear and corrosion.
Found on
http://www.probertencyclopaedia.com/browse/GG.HTM

Type of bronze, an alloy high in copper (88%), also containing tin and zinc, so-called because it was once used to cast cannons. It is tough, hard-wearing, and resists corrosion
Found on
https://www.encyclo.co.uk/local/21221
No exact match found.