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I opened it in a new tab. By the time I looked at the tab it was in full epilepsy induction mode. Thankfully I don't suffer from it.

Perhaps don't start the game until it receives a focus.

Yes I understand this is a bit problematic.

Not a bit! Could be life-threatening. I'm unsure what the flashing does, but please reconsider it?

EDIT: Just checked and the effect is only visible on Firefox. Works fine in Chrome.