There is also phosphor, a browser-based fps game, but I do not know much about it since I never played it before.
First off, we have Lyle in Cube Sector. LiCS is an excellent Metroid tribute with an unorthodox fighting system.Next, we have all of Nifflas' games. They are all very atmospheric and fun to play. I highly recommend Within A Deep Forest and Knytt Stories. Furthermore, there is Nikujin, an amazingly awesome, hardcore, Japanese platformer where you play as a ninja.Lastly, we have RigidChips, a Japanese sandbox vehicle game. Very fun, and in English. (On the main site for the game, scroll down and download the newest beta instead of the link at the top of the page)
Legends looks pretty schweet.