Original take on the theme. I found it a bit strange and abrupt that you die when you have too much oxygen though. Maybe you could have clarified this by increasing the sound speed, or by letting the meter shake once it is close to a fatal level.
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Thanks for reply! Original idea was that Henry gets a vertigo for high O2, and every other extreme value also gives a different debuff. Entire death condition and screen are kind of a last minute fix. I must have tested it more in-depth. Sound pitch and shaking would be smart. Thanks for your ideas, it really helps me thinking forward!