If you liked this
Games like Optional Boss
If you finished Optional Boss, the closest matches are Star Citizen, Hytale, Cairn, No Man's Sky and Mewgenics. All 36 share its adventure genre and are ranked by how closely their themes and modes overlap.
Star Citizen
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Hytale
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Cairn
74
No Man's Sky
91
Mewgenics
92
Abiotic Factor
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Welcome to Elderfield
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Pathologic 3
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Escape the Backrooms
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Skate Story
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Wanderstop
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Nighthawks
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Caves of Qud
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Cult of the Lamb: Woolhaven
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Will: Follow the Light
72
Outbound
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Starsand Island
95
Slay the Princess: The Pristine Cut
76
Solarpunk
87
Promise Mascot Agency
80
Strange Antiquities
90
Keep Driving
84
Pacific Drive
80
The Coin Game
80
Retrospace
86
Core Keeper
86
Dredge
93
The Exit 8
87
The Jackbox Party Pack 11
85
Back to the Dawn
92
Copycat
70
Winter Burrow
79
Collector's Cove
90
Pacific Drive: Whispers in the Woods
80
The Operator
85