Arcade

Ragdoll Masters
Ragdollsoft(Trial version)
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An excellent 2D beat 'em up
WingNuts
Freeverse(Trial version)
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WingNuts: A Thrilling Arcade Game for Mac
Mari0
Stabyourself(Free)
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Fan made Mario/Portal hybrid game
Frostpunk
11 bit studios(Paid)
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Challenging Moral Decisions in Frostpunk City-Building Survival Game
Jungle Heart
Elephant-games(Trial version)
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A trial version app for Mac, by Elephant-games.
DX-Ball
Ctspgames(Free)
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A Brief Introduction To DX-Ball
Happy Wheels
TotalJerkFace(Trial version)
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Happy Wheels - Physics-Based Car Game
BOOM
Kagi(Trial version)
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Blast aliens in this award-winning arcade game
Parking Ticket Mayhem
Raccoon Formality(Free)
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Chaotic Arcade Fun: Parking Ticket Mayhem Review
Memochi - Dust
AndyL4nd(Free)
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Free memory collection game