82		Lost Base Escape (Windows, 2017)
81		Reframed (Windows, 2018)
72		Reficul (Windows, 2017)
68		Layers of Fear (Windows, 2016)
64		DayZ (Windows, 2013)
58		Phantaruk (Windows, 2016)
57		Alien: Isolation (Windows, 2014)
55		The Long Dark (Windows, 2014)
55		Montas (Windows, 2014)
55		Ghostship Aftermath (Windows, 2014)
54		Reverse Side (Windows, 2015)
53		SCP: Containment Breach (Windows, 2012)
53		Syndrome (Windows, 2016)
53		Raptor Valley: Night 1 (Windows, 2016)
53		Sky Break (Windows, 2016)
53		Alien Swarm (Windows, 2010)
53		Night Light (Windows, 2016)
52		Syndrome VR (Windows, 2017)
52		Way of Hero (Windows, 2017)
52		Horror Hospital (Windows, 2017)
52		Wraith (Windows, 2017)
51		Overkill's The Walking Dead (Windows, 2018)
51		Mist Survival (Windows, 2018)
51		The Forest (Windows, 2014)
50		Cryostasis (Windows, 2008)
46		The Padre (Windows, 2018)
44		7 Days to Die (Windows, 2013)
44		10 Years After (Windows, 2015)
43		Shadows Peak (Windows, 2016)
43		Deep Rock Galactic (Windows, 2018)
42		Visage (Windows, 2018)
42		Silent Debuggers (Windows, 2017)
42		Conan: Exiles (Windows, 2017)
42		Undead Development (Windows, 2017)
41		Desolate (Windows, 2018)
41		Throw Anything (Windows, 2018)
41		Soviet Lunapark VR (Windows, 2018)

Notes: Games similar to Subnautica, Games like Subnautica, Unknown Worlds Entertainment, Inc., Unknown Worlds Entertainment, Inc., Windows, Action, Sci-Fi, Futuristic, Survival Horror, Survival, 1st-person, Unity, Aquatic, Underwater, Submarine, PC, Game Similarities.