Well, you can use it for mobile devices as Air app however pure FP does not use GPU. It is based on Bitmap functions and some Draw class methods use direct setPixel calls to draw shapes. Please note that there was Sos Sosowski's version of FP which used GPU to render entities. You can find it somewhere in forum. Before you actually switch to his version do the math to see if it's worth it. Simple games should work just fine with latest engine version.