I picked up
The Swapper on the sale the other week, which I enjoyed. Atmospheric 2D platformer (you really do feel like you're almost alone in space), puzzles that had me stumped a few times, and a storyline which made me go "lol whut" and think about it for a day after I finished it. I like how the art assets were handcrafted from junkcraft and claymation, then digitized.
Also bought
Spelunky at the same time. Roguelike 2D platformer, reminds me of DOS classics somewhat. Randomly generating levels, hard as nails, get sent back to the start on death - sort of what makes FTL fun for me.