Technically speaking an HTML5 client would be most widely compatible, for iOS/Android and Windows/Mac/Linux PC.
For instance they made an HTML5 port of Angry Birds... quite where the technology is at I couldn't say but MULE is obviously not very demanding graphically!
This would require a complete new version though; it is a major job!
Well, MULE is a classic, so it will never get old. You have plenty of time, no hurries.
Take yer time, boi!
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