I'm using GSAP for HTML5 games on mobile devices, it works great so far. One thing I noticed though, when some browser events happen, such as rotating devices which would force screen resizing, or change to fullscreen mode, GSAP tween likely stop working and break the game logic.
I did some search someone had similar issue (that case not on mobile though), the workaround was to set a timeout instead of using onComplete function. I'm not quite sure whether GSAP would plan to investigate these issue or not.
Thanks