If you’re playing games that give you a response with your heart rate, them id say that’s probably a bit risky. Would definitely be worth asking your doctor as I am not a medical professional. Could be worth trying some more chill games that don’t produce an adrenaline response like that.

You might like the movie Arq, was a pretty interesting time loop movie on Netflix

Dumping warm water back into these systems usually is even worse as it can cause a host of issues for wildlife. A closed loop system should definitely be used though.