http://www.kongregate.com/games/inno...ames/amorphous
A mere flashgame that is just so fucking good and enjoyable. I love amorphous+. This thread actually reminded me of it, I might just have to redo 100% for the n'th time.
It's super simple yet complex. You are a guy with a big fucking sword and slash down blobs in many varieties. Includes cool lore and 110 achievements.
AdventureQuest Worlds
Been playing it since I was 12. Go figure ;o