You are running on aging hardware (512MB to 1GB of RAM). To keep games from crashing:
Your iPad is not obsolete. It is a vintage arcade machine. Play it proudly. games compatible with ios 9.3.5 ipad
now require iOS 13 or higher, there is still a massive library of "legacy" titles that run perfectly on iOS 9.3.5. You are running on aging hardware (512MB to 1GB of RAM)