here are some free games that you don't have to steal
Cave Story(most people here already know this one)
Spelunky
Dwarf Fortress(haven't tried it personally but I hear it's good)
Seiklus(not for those easily bored but a great exploration game regardless)
Iji(I personally recommend this one)
Paradise fort(I have yet to play it)
Bonesaw(love it, but it's really hard)
Powder(not a fan of games like this personally but it looks fun for those that are)
Night of the Cephalapods(Good novelty game and fun for a while but not much replay value)
Runman(highly recommend this one)
Action Fist(great retro side scroller feel to it)
Warsow(one of the best free multiplayer shooters on the net)
super Crate Box(haven't tried it myself but it looks awesome)
Assasin Blue(great platformer imo)
Barkley Shut up and jam gaiden(one of the best RPGs I've ever played, with a combat system similar to paper mario)
chalk(interesting take on the side scrolling shooter genre)
Cave Story(most people here already know this one)
Spelunky
Dwarf Fortress(haven't tried it personally but I hear it's good)
Seiklus(not for those easily bored but a great exploration game regardless)
Iji(I personally recommend this one)
Paradise fort(I have yet to play it)
Bonesaw(love it, but it's really hard)
Powder(not a fan of games like this personally but it looks fun for those that are)
Night of the Cephalapods(Good novelty game and fun for a while but not much replay value)
Runman(highly recommend this one)
Action Fist(great retro side scroller feel to it)
Warsow(one of the best free multiplayer shooters on the net)
super Crate Box(haven't tried it myself but it looks awesome)
Assasin Blue(great platformer imo)
Barkley Shut up and jam gaiden(one of the best RPGs I've ever played, with a combat system similar to paper mario)
chalk(interesting take on the side scrolling shooter genre)