Just wanted to post here in case the devs see it

Store listing says Cloud Saves supported, but it seems that's not the case? At least, I can't use cloud saves in Heroic.

Same exact scenario for me. Tried the game out on Heroic Games Launcher, on Linux, and noticed it didn't have the cloud saves option. Then, installed it via GOG Galaxy (with Lutris) and noticed that in the game options ("Configure") the "cloud save sync" option appears greyed out and unclickable/unselectable. The devs either forgot to turn that on or they erroneously advertised cloud save functionality in the game page, when they meant not to have it.