This is the Mac OSX version of the new Cypress v1.1 beta.
Extract the app from the DMG, and open the app. Special notes for Mac users: If your mouse does not have a right button, you can use Control-Click. Also, when first starting the game, you may see a message about Cypress being from an "Unidentified Developer". Select "Open" again, and your preference will be saved. (You may wish to read Apple's notes on configuring Gatekeeper). To read the copyright information files referred to on the title screen, right-click to open the app's context menu, and choose "Show Package Contents." (Or, use the Finder's "Go To Folder" function by pressing Command-Shift-G, and open the app.) Inside the subfolder "Contents" you will find the text file COPYING, and the Licenses subfolder.
There is a bug in the current Mac version. If you install the cypress.app into the system "Applications" folder, the save-progress functionality of Cypress may not function. As a workaround, you should put the App on the Desktop or elsewhere outside "Applications" where your user has the permission to write files.
Thanks for the tip. I generally use a ~/Games folder anyways. : )