That did indeed worked! Thank you so much vezuvi, I really appreciate it! That's the only thing that worked on this unbreakable gameI think the "AssetRipper" was used for that. You need to launch it and select the "File>Open Folder". Then you need to select the game folder, and then select "Export>Export All Files". Select the separate folder and click "Export Primary Content".
For FutakinValley most of the IMG assets will be in the "Assets>Texture2D"
I'm not very good with that, maybe others have better solution but it works for me.
Sorry, I have no info on how to hack the game, but it's demo anyway