cool idea for a 1 button game and well done for uploading a game on time.
for improvements i would say that something 'satisfying' needs to happen when you click on time so the user has some feedback and so they feel good and the red background is really intense!!!!
instead of speeding the rings up to make it harder, maybe you could have added a 'zone' where the player needs to click inside of and have that zone be smaller to make it harder. furthermore, that zone can be randomly placed along the rings.