Hi, there are probably a lot of possible reasons as to why your Mac is overheating. It might be because it has to simultaneously run Bootcamp and whatever game you are playing. From my experience, PC games running on bootcamp tend to cause Mac laptops to get pretty hot, regardless of how complex the game is. If your game uses online multiplayer, it will probably cause your Mac to overheat to the point where it feels unsafe.
As for ways to keep your Mac cool, here are some simple things you can do:
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Close whatever programs you can while running games (on Bootcamp or Mac). Games tend to take up the majority of your processing speed, and the less programs your computer has to run, the less it has to work.
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Free up some disk space. Make sure you have a fair amount of free space in your hard disk. If your memory is almost completely used, your Mac's overall performance will decline, which may cause it to overheat. Roughly 30gb is a good amount in general, the more the better.
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Buy an external fan. From personal experience, pretty much every game I play makes my Macbook Pro get really hot after a while. I purchased an external fan that my Mac rests on top of and it does an awesome job of helping keep the temperature down. Mind you, it won't fully prevent your Mac from overheating, but it is definitely a worthwhile investment and can help prevent long-term damage. A quick search in Amazon or a desired marketplace should give you different options.
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Take some breaks. Macs aren't really built as gaming computers in the first place. If you game for 1-2 hours, close all programs and take a 30 minute break from the computer to allow it to both cool down physically and to let all the internal hardware take a break from working so hard. (You might want to play for a shorter amount of time or take longer breaks depending on how concerned you are about damaging your Mac.)
I hope that helped!
Note: I am by no means a technical expert. There are definitely much more knowledgable people out there who can give you a better answer geared towards your Mac's software and operating system.
My Mac that i've mentioned above is a 2015 13-inch Macbook Pro.