How to run the Mac demo!
If you try to open the demo directly after download, you'll be greeted by this sad message:
This is because downloading a .zip file containing a .app will be treated by the Quarantine service on the Mac as a potential security threat (which Stratospiel is not).
To fix this, go to Finder → Applications → Utilities → Terminal.
In the Terminal window type the following command exactly like this:
xattr -d com.apple.quarantine
Leave a space after the command, then drag the stratospiel.app file onto the Terminal window and "drop" it after the space, so that the filepath will automatically be created for you.
Then, click enter to run the command. Note that you won't get any "success" feedback - it'll just make a new line:
Now, the game should no longer be quarantined and should run fine!