Thank you for releasing a Mac version. I found a minor problem with how that file extracted: instead of giving me an application, it gave me a folder called "Contents". Mac applications are basically directories/folders with a ".app" suffix. I created a folder called "Sandtrix", put the Contents folder into it, renamed the folder "Sandtrix.app, then I was able to play the game. Probably the command you used compressed the contents of the application without including the top-level directory, so should be simple to fix.