Steam Cloud save support: New save games are now also saved in the Steam Cloud. That should fix the problem that local saves are not showing up for some users.
Shock Tactics update for August 12, 2017
Patch v6185
View all patches · Build 2009329 · Last edited March 15, 2019 – 18:31:04 UTC by 
Wendy
Patchnotes via 
Steam Community