I'll be keeping Greenlight to the Steam thread from now on, but fans of bandwagons may observe that the items most in demand for Steam (that I can see) are:
1.
Black Mesa, 47%
2.
Project Zomboid, 31%
3.
Routine, 23%
4.
Octodad: Dadliest Catch, 10%
5.
Miasmata, 9%