For any of you struggling with this game to work, Alexosker and ϟϟ Illusion gave solutions for PC, i tried them in Steam Deck and now the game works wonders. Here are the steps i did: 1-You need a GOG verison of the game

2-Copy Obscure.Exe, Settings.Exe and the folder "_videopc"

3-Paste and Overwrite the Exe files in the game folder, create a new folder named "data" and paste the "_videopc" folder inside the new one.

4-Rename the file "cachpack.hvp" to "datacach.hvp"

5-Launch the game in desktop mode (the buttons stopped working so i had to use the screen), it will open a window and you need to click the file "Settings.exe", another window will open, select the resolution and proceed.

(Note: at this point i had to restart the deck because i couldnt close the game, but after that i run it from Gaming mode with a community layout for the controls)

Im not sure if you can do it all in the Deck, but i recommend doing the steps in a Pc, compress the files into a Zip file and upload it to Drive, then you can download it from the deck and do the steps.