I don't know if I am not installing it right but I am new to macOS.

Bitty Started right up on my Windows. But not on my MacBook 

So I went to Steam and downloaded the demo and that version of Bitty started right up. So i know it is compatible on my MacBook .

When I download it from itch.io the files are not in a zip file.

I right click on the app to see it contents /Users/myusername/Desktop/bitty.app/Contents/MacOS

double click the bitty_drm_free it can't verify so I go to my  System Preferences - Security & Privacy - General then I unlock and allow it to run.

a window pops up with a lot of text .

Now I go back and double click the bitty.app and all I get is a message saying that

You do not have permission to open the application “bitty”.

Contact your computer or network administrator for assistance.

8( 

Hi Jessica8D,

Just copying the installation instructions on the page bottom:

MacOS

1. Download and unzip the package
2. Apply execution permission to the executable (i.e. "chmod 777 bitty.app/Contents/MacOS/bitty_drm_free")
3. Execute by double clicking "bitty.app"

See also: https://itch.io/t/1691591/mac-version-corrupt

Still nothing 

I downloaded the package  but it is not in a zip file just a bitty.app 

Then I right click on it and select -Get Info then go to -Contents/MacOS/bitty_drm_free and double click it then it says can't verify

so now I allow it in my security .

 Now a command window opens when I try opening the -bitty_drm_free 

and still nothing when I double click the bitty.app.

Now if I open my command window to apply the chmod 777 /bitty.app/Contents/MacOS/bitty_drm_free

and try to open ether it tells me that its damaged to delete.

Googled, and found this https://osxdaily.com/2019/02/13/fix-app-damaged-cant-be-opened-trash-error-mac/

Apply both `xattr -cr bitty.app` and `chmod 777 bitty.app/Contents/MacOS/bitty_drm_free` should work, tested on a Big Sur.

Thank you so much for your help you are so Awesome for taking the time to help me .

Applying the xattr -cr did it.

 After applying it the will open and then crash but I rebooted and it started right up.

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I had to put the bitty.app in the directory /Applications/bitty.app/Contents/MacOS/bitty_drm_free

Then double click on the bitty_drm_free 

Open   System Preferences - Security & Privacy - General then  unlock and allow it to run.

Open the Command Terminal and paste and run both the command.

chmod 777 /Applications/bitty.app/Contents/MacOS/bitty_drm_free

 xattr -cr /Applications/bitty.app

Then Reboot 

It Worked 8)

Nice! I'll update the instructions.

BTW. I also tried to package it in a .dmg instead of .zip, turns out it requires the same commands. Seems Apple has tightened their strategy for running 3rd-party apps outside AppStore.