For this to run, you'll need to do one of the actions below:

• Use the Unarchiver app to unzip the ZIP file.
• OR download the game from within the Itch.io app.
• OR execute the following on the command line:

cd [to the directory where Pumpkins.app is located]
cd Pumpkins.app/Contents/MacOS
chmod +x Pumpkins

After this, you need to hold control + right-click on the application, and select Open.

MacOS Catalina 10.15.7 here and game is working fine.
Used the itch.io app to install and launch.

One thing you can do is, if you know someone who does have a Mac, have them do the chmod +x to the binary, zip it back up (right click > Compress Pumpkins.app will work) and send it back to you to upload to itch.io. The zip file created this way will preserve the executable permission. Users will still need to right click > Open the app to get past the "we can't check it for viruses" thing, but they at least won't need to use the Terminal on it themselves.

Edit: Not sure if this is expected, but Pumpkins.app also has no icon. Not an issue for running the app or anything, just wanted to point it out in case it should have one.

Is there no macOS version this year? :(

It looks like there is no new macOS client after the last update, do you plan to have a new one soon (hoping the 'Linux and Windows' is temporary 🤞)?

No Terminal stuff required in Sequoia, FYI!

You just have to:

1. Change your Security setting "Show Applications From" to "App Store & Known Developers".
2. Try launching the Ghost Town application you downloaded. (You'll get that deeply insulting pop-up about how Apple is protecting you from, um, software).
3. Go back to your Security settings (in System Preferences), and scroll to the bottom. You'll see an option to run the ghostly app the OS just blocked.

It should run, and you should just be able to double-click the application in the future.

Is it dumb and hostile? You betcha! But not too time-consuming.