That all changed yesterday when I was introduced to a wonderful little gem called Winterbells.

Don't be fooled by Ferry Halim's cute-as-all-get-out graphics--this game is one tough cookie. Although my current high score is 33,210, my typical score is around 3,000.
Anyway, if you find yourself with a few minutes (hours) to spare this afternoon, I'd highly recommend giving it a go. (Play it here.)
See also: 'Fabulous flash game alert: Robot Unicorn Attack'