For years now, I've been going to this site to play the most beautiful flash games. The artist, Ferry Halim, releases 2 or 3 per year, and once you play a few, you can see why. The art and music is incredible, and obviously took more than a couple of hours to slap together. The games are simple and almost childlike. Go and check it out:
Orisinal
The ones with the kid in the hot air balloon, the bumblebees, and the dragon flies are my favourites.