Transistor and Super Meat Boy!
Transistor is just a work of art. I love Supergiant Games for making Bastion, but I think Transistor was even better. The music, the combat system, the visuals! It's all so great! Seriously, it's the only game where I considered ordering a physical copy of the sountrack.
And Super Meat Boy is a great game for people who are looking for really tough platgformers. When you die, it's not frustrating. It's actually your fault. You instantly respawn and the music doesn't stop. This makes a huge difference over other games like IWBTG, which are way more frustrating. I spent about 65 hours on Super Meat Boy, and I am far from getting all the achivevements. (Which is near impossible anyway.)