Definitely do; i would just ask you to mention whenever you used portions of my code. The source is quite old, though, and will probably need many changes to work with current versions of Unity. If you need any help to figure how something works, feel free to send me an email (suribe [at] perroelectrico [dot] com).
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Thanks! :) I released it for Android and iPhone some time ago, but it did not return any money and keeping track of the idiosyncrasies of the app stores was too much work. Full source code for Unity is here: https://github.com/seuribe/flip, if you're interested in compiling your own mobile version.