Place your modified files in atmosphere/contents/[TitleID]/romfs/ . The game will load your new features instead of the original ones when it boots.
Depending on what "feature" you want to add, you have two main paths: Lil Gator Game (NSP)(Update 1.0.1).rar
You can use UABE (Unity Assets Bundle Extractor) or AssetStudio to view and replace textures, sounds, and 3D models. 3. Feature Development Methods Lil Gator Game (NSP)(Update 1.0.1).rar