55		KOPS (DOS, 1996)
55		Eradicator (DOS, 1996)
54		Universal Warrior (DOS, 1995)
53		Hyperoid (Windows, 1994)
53		Thunder Zone (DOS, 1994)
52		Insaniquarium! Deluxe (Windows, 2005)
50		Eradicator (Windows, 2014)
50		KOPS (Windows, 2001)
45		Xenophage: Alien BloodSport (DOS, 1996)
44		Doctor Who: Destiny of the Doctors (Windows, 1997)
43		Cyberwar (DOS, 1994)
42		Beat Hazard 2 (Windows, 2018)
41		Attack of the Saucerman! (Windows, 2000)
40		The Maw (Windows, 2009)
40		Xenophage: Alien BloodSport (Windows, 2015)
40		Clawface (Windows, 2018)
40		Space Adventure (DOS, 1988)
40		The Eternal Castle (Windows, 2019)
40		Warp (Windows, 2012)
40		Shiftlings (Windows, 2015)
40		Gravity Fight (Windows, 2003)
40		Tommy's Lander (DOS, 1986)
40		Astervoid 2000 (Windows, 2016)
40		Project: Starfighter (Windows, 2003)
40		Monkeys Odyssey (Windows, 2003)
40		Cobalt (Windows, 2016)

Notes: Games similar to Gubble, Games like Gubble, Actual Entertainment, Inc., Actual Entertainment, Inc., Windows, Action, Sci-Fi, Futuristic, Arcade, Puzzle elements, Real-Time, Extraterrestrial, Alien, PC, Game Similarities.