I got the humble bundle recently purely for Dungeon Defenders + all the DLC, so heres the rest for whatever lucky duder/duders get it!
Please only use the key if you intend to play the game, don't just take these to bulk out your steam library.
Also I'm well aware there are Steam giveaway things I could go through but this is just way faster....
Dynamite Jack Steam Key
Beat Hazard Ultra Steam Key
EL4ZM-9CRHZ-V4K6R GRATZ KRULLBAN!
Nightsky HD Steam Key
Solar 2 Steam Key
Super Hexagon Steam Key
9DIYB-C9PKN-TZTLZ GRATZ DALETIEL!
ALL KEYS TAKEN!