I'm currently trying out Steam Cloud saves so the game can run on services such as GeForce Now (which require cloud saves to be enabled). If you'd like to try this version (and check for any bugs please!) the version is currently on a Beta branch.
To get it, right-click on the game in your library, go to Properties then click BETAS on the left, then where it says 'none' select 'steam_cloud - Steam Cloud Version.'
The game should save both locally and to the cloud, both are time stamped so when loading your current game it'll pick the most recently saved, which will then become the default next time you save again.
As far as I can tell it's working OK, but obviously please let me know if you find anything wrong. Please don't try this if you're still playing through your first game!