Linux version of Dead Cells from GOG.com doesn't support cloud saves so I tried to copy save files manually.
But I have trouble when moved Dead cells savegame from Linux to Windows.

Steps to reproduce:
1. Install latest Dead Cells 1.2.10 from GOG.com to Ubuntu 16.04
2. Start playing
3. Copy file %DEAD_CELLS%/game/save/user_0.dat from Linux machine to Windows PC
4. On Windows PC install latest Dead Cells 1.2.10-2da3fd680 from GOG Galaxy.
5. Copy file user_0.dat to "save" folder.
6. Run the game

Actual result: Error "Cannot access saved game. This saved game requires a more recent version of the game".

As far as I can see, Linux version has the same ID "2da3fd680" but different release date 2019-03-29.