Lets try and make a list of desent games:
iji - shooting maddnes
a untitled story
iwbtg - hard
sybon-action - unfairness
cavestory - one of the best games ever manga and looks like its old.
iwbtf v3 - a iwbtg fangame
knytt - very pritty relaxing game
knytt storys - like knytt but harder and you can make your own levels.
within a deep forest - your a boncy ball saving the world
Lab 14 - a short puzzle game
Perfict Cherry Blossem - a mad shmup only the first 3 levels are free though...
The last pike man - a bit like iwbtg its hard but fun, a little easyer than iwbtg though.
Blades of Heaven - a rpg
karoshi 2.0 - kill your self
wubly 1 - very hard and fast paced
Ancient Domains of Mystery - www.adom.de
its ment to be harder than IWBTG. ITs a rpg with no graphics.
5 Days a Stranger, 6 days a sacrifice and 7 days a skeptic - Fullyramblomatic.com. A weird series. Its a point and click adventure horror game. Very good!
1213 - Fullyramblomatic.com Great story but bad gameplay
Little Fighter 2 - http://www.littlefighter.com/
The house - Its funny I think
MUGEN - its a fighting game where you can play as anyone/anything on any level. Well youv gota make the player/level or download someone elses.
Frozen Fruits - a old clasic, but remade.
ADOM - A text based game. Its a good one though!
Spelunky - A clasic style game where the levels never the same, defently wereth a go.
jumper 1 and 2 - its realy hard and simple very fun.
super random game of fun 2
nameless platformer - its nameless.
barry the bean
hard hat 1,2 and 3 - made in game maker i think and fun, megaman style
toribash - Its a fighting game where you can make your own attacks, its a sort of sandboxing fighting thing i think.