The cloud save does not seem to work. But according to the store page it should be available.

I noticed this too. In Galaxy, if you click on Inscryption, Settings, Manage Installation, Configure, you can see the cloud saves button is entirely grayed out. Not sure if the store page erroneously says cloud saves are available, or if something is busted from our end. In either case, it's frustrating

Same frustrating issue here. I'll try to setup some kind of synced folder trough a cloud provider, but it's not optimal...

Just checked with the new patch, and it still didn't even address that this is an issue

did the endless mode that was on the steam version get added?

Are you talking about Kaycee Mod? It released today on all stores GOG, Steam, and EGS.
https://www.youtube.com/watch?v=_ZEoVfMGgJM

Thanks for info MeanJim

My save corrupted. No backup available. No cloud storage. Just a cold "F U buddy!"

Has this been addressed? Cloud save is important to me as I play on the go with a GPD Win Max and later at home I jump to my main rig.

No it is not. Best to set up some manual way to sync your saves to the cloud like onedrive or dropbox, and then have them synced back to your desktop once you get over there. Very disappointed in this