Hi there, welcome!
I'm not a gamer, so I cannot help much here...
I just remember something about the fact that palying games with steam can have an effect on the compositor.
So you may want to try to make a alt+shift+f12 before playing (to disable it) and then again to re-enable it.
Anyway, please post your system specs with the output of inxi -Faz for others to help.
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