It Takes Two. Bugs recently got linked on MeFi, and while I like it, this game is just...charming.
→[More:]Really beautiful music and art, and if you manage to hit two little treats or more at once for the kitty or puppy, you are rewarded with the cutest sound effects. Make sure to get the little floating hearts to keep playing! (It took me a few tries to stop crapping out in a minute, but it was worth it.)
Then there's
High Delivery. Beautfully simple and blissful.
Entertainment for your next sick day(s), I hope!