If you are able to compile Swift 2.0 in Xcode 7 or higher, the files below are pretty much all you need.

1. Create a new SpriteKit project for either iOS or Mac
2. Create the files below
3. include the following line at the end of the ViewController setup: 
        scene.setLife()
4. Define the type alias RMColor based on whether you are developing for Mac of iOS: 
        typealias RMColor = NSColor (iOS) / UIColor (Mac)