Echo light ring to indicate timer progress/countdown
A timer would be improved if I could quickly see the progress without asking how much time is left.
I suggest that you use the light ring to count down the timer: starting with the light ring fully lit when the timer starts, it could progressively dim, a bit like the hand of a clock.
There could also be a light flash warning when, say, 1 min from the timer ending.
It would be nice also to save and recall a timer that I use often.