bzzzzzt... calling all gamers...

free ones

frog fractions
super cool and funny flash game
http://twinbeardstudios.com/frog-fractions

goblet grotto
made by pals, callback to early 3d pc games. absolutely incredible. the best game i've played in years. for mac and pc.
http://harmonyzone.org/GobletGrotto.html

not so free ones

hotline miami
made by cactus and friends. 80s chillwave murder sim. top down GTa arcade game. its brutal, colourful, just great. published by the guys who published serious sam
http://www.youtube.com/watch?v=MNxGZIQpuO0
http://www.youtube.com/watch?feature=player_detailpage&v=qqS51B4sdGc#t=179s
http://hotlinemiami.com/

incredipede
for fans of: spore, world of goo, crayon physics, any sort of physics based puzzle game. very cool art style.
http://www.incredipede.com/
http://www.youtube.com/watch?v=3Ha9BQBuIUk