iPhone 6 can’t launch PUBG MOBILE

Hello,

Can somebody help me, I don’t know what is going on with my iPhone 6 64gb iOS 11.4, I can’t launch the PUBG MOBILE game, but I can launch Rules Of Survival and Garena Lien Quan Mobile, I restarted my iPhone and installed the latest version of iOS and PUBG MOBILE, but not things work

Thanks!