Thanks for the link and your recommendations. I think my games meet your recommendations with the possible exception of using static bright red. Does bright red cause an issue when it's not flashing? For example in Return From the Tavern, the timer turn red when there is 10 seconds left then it stays red and I convey urgency only via a ticking sound.
You make me think that browsers need a shortcut to disable/enable animation, just like Ctrl+M mutes/un-mutes a tab.