🤑 Indie game store🙌 Free games😂 Fun games😨 Horror games
👷 Game development🎨 Assets📚 Comics
🎉 Sales🎁 Bundles
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You have to change your preferences in the settings.

Follow these steps: System Preferences > Security & Privacy > General > Allow applications downloaded from > Anywhere

(alternative method: while pressing the "control" button, click on the app from which the warning message comes, then click "open")
(I haven't tried this one though, only found it looking up on the Internet)

Thank you so much!