I thought I should leave everything the same as the original app, but you may be right. The game should give you coins at the end of a match, but if you want free coins, then go to this path: "C:\Users\<your username>\AppData\Roaming\Godot\app_userdata\Marble Wars" - windows, or "~/Library/Application Support/Godot/app_userdata/Marble Wars" - mac (idk the path in linux), open "settings.cfg" with Notepad or other text editor, and change the "coins" value. Hope it helps, thanks for supporting my work :)