PixelJunk Monsters ($1.99)
https://www.humblebundle.com/store/pixeljunk-monsters-ultimate
Volgarr The Viking ($0.99)
https://www.humblebundle.com/store/volgarr-the-viking
F.E.A.R. ($2.49)
https://www.humblebundle.com/store/fear
Ziggurat ($3.75)
https://www.humblebundle.com/store/ziggurat