🤑 Indie game store🙌 Free games😂 Fun games😨 Horror games
👷 Game development🎨 Assets📚 Comics
🎉 Sales🎁 Bundles
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Yes, on Windows you can either press Alt+Enter, or add " -screen-fullscreen 0 " to the command line of the executable. 

Not sure what the equivalent on Mac is, I don't own a Mac myself, hopefully some Mac user will be able to chime in with an answer.