1.0.7 - Steam Overlay Update

I've just published an update which enables the Steam overlay!
Pressing your default key combination (usually SHIFT + TAB) will bring up the Steam overlay.
I have tested it a little and it seems to work smoothly.
Please let me know if you have any problems with it.

I have also made some changes to the puzzle selection in the Humans category, for a more coherent art style.