Do you have a lot of apps installed, as in most of the memory is taken up or have apps running in the background? Does your phone run slow on other apps? 12-16 FPS seems awfully low even for mobile. I'm not even sure if any of that would help but I'm at a loss of what else to try since I can't recreate it myself. Sorry I can't do more to help, I added one final version of the game that has everything up to date to see if that helps.
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Damn, yeah I really don't know what else to try then. Sorry I can't be of more assistance, I'm really not sure why it's happening no matter what you try. I appreciate you at least working with me to try and resolve the issue. For me, it's worth all the effort if it means one more person can try my game out. Maybe eventually a solution will be found. Thanks for trying to give it a try.