Phone on its way out??

Hi everyone. My phone has recently started to get very hot when I'm playing word games. Is this normal for phones or does it mean my iPhone 12 is on its way out? I don't remember this happening as much a few years ago. I am also unable to turn the brightness up more than half way when it overheats. For context, I had the battery replaced in January 2024 and it is currently on 91% (but has been for a while). Thanks in advance.