Dustforce on Steam
Holy hot hell is this game something else. I've only played to perfection 3-5 levels (srsly, they're only like 50-100 sec long) and already spent 3 hours gritting my teeth to get that perfect run. N+ acrobatics, Super Meat Boy challenge, some light combat, and a demand perfection likened to Trials HD. Oh, and the graphics are great, the art design cartoon-y and pretty, animation smooth and varied, and the music is fantastic.
Music is great, too.
Kindle Reading List (163,457 Locations Completed)
Finished: Aquariums of Pyongyang (2535), Under the Loving Care of the Fatherly Leader (24,074), The Lone Samurai (4753), Nothing to Envy (5349), Shogun (26,263), Eating with the Enemy (9170), Fight Club (3218), River Town (7524), Don Quixote (21,430), The Party(6492), Bravo Two Zero (7340), Rogue Warrior (7602), Mao's Great Famine (11,059), His Dark Materials Omnibus (20,766), Moon Lander (5882)
King Rat (9308)