Bastion (75% off)
http://store.steampowered.com/app/107100/
I highly recommend Bastion; it's definitely one of the most enjoyable games I've played in years.
The link has a nice 102 second video and there's even a free demo if $3.74 is too rich for your blood (I got Bastion as part of the Indie Humble bundle).
That's 10am PST for you West coasters!