85		Stars! (Windows, 1996)
83		Spaceward Ho! (DOS, 1992)
83		Emperor of the Fading Suns (Windows, 1996)
82		Master of Orion 3 (Windows, 2003)
82		Space Empires III (Windows, 1997)
80		Stars in Shadow (Windows, 2017)
80		Reach for the Stars: The Conquest of the Galaxy (DOS, 1988)
80		Anacreon: Imperial Conquest in the Far Future (Windows, 2004)
80		StarDrive II (Windows, 2015)
80		Space Empires IV (Windows, 2000)
80		Anacreon: Reconstruction 4021 (DOS, 1987)
72		Worlds at War: Conflict in the Cosmos (DOS, 1991)
59		Master of Orion (DOS, 1993)
57		Master of Orion II: Battle at Antares (Windows, 1996)
57		Master of Orion II: Battle at Antares (DOS, 1996)
56		Alien Legacy (DOS, 1994)
54		Great Nations (Windows, 1997)
53		Endless Space (Windows, 2012)
52		Armada 2525 (DOS, 1991)
52		Into the Void (DOS, 1997)
52		Endless Space_2 (Windows, 2017)
52		Pax Imperia: Eminent Domain (Windows, 1997)
50		Master of Orion (Windows, 2016)
50		Exodus: Proxima Centauri (Windows, 2018)
50		Warhammer 40,000: Gladius - Relics of War (Windows, 2018)
50		Star Lords (DOS, 2001)
50		Pandora: First Contact (Windows, 2013)
50		The Viceroy (Windows, 2015)
50		Lost Empire (Windows, 2007)
50		Legends of Pegasus (Windows, 2012)
50		Space Empires IV Deluxe (Windows, 2005)
50		Star Trek: The Next Generation - Birth of the Federation (Windows, 1999)
50		Invasion (Windows, 2008)
50		Space Empires V (Windows, 2006)
50		Armada 2526 (Windows, 2009)
50		Distant Worlds (Windows, 2010)
49		Sid Meier's Civilization (DOS, 1991)
48		Master of Magic (DOS, 1994)
44		Master of Magic (Windows, 1997)
43		Call to Power II (Windows, 2000)
42		FreeCol (Windows, 2003)
42		Galactic Civilizations II: Dread Lords (Windows, 2006)
41		Hegemonia: Legions of Iron (Windows, 2002)
41		Sid Meier's Civilization: Beyond Earth (Windows, 2014)
41		Galactic Civilizations (Windows, 2003)
40		Reach for the Stars (Windows, 2000)
40		Sovereignty: Crown of Kings (Windows, 2017)
40		Galactic Civilizations III (Windows, 2015)

Notes: Games similar to Imperium Galactica, Games like Imperium Galactica, Mirage Software, Mirage Software, DOS, Strategy, Tactics, Sci-Fi, Futuristic, 4X, Turn-based, Top-down, PC, Game Similarities.