The document summarizes the research Oliver Keppie has done on existing products that are relevant to the game he is developing. He looked at Cuphead, Mortal Kombat, Double King, and Silly Symphonies. Some common features he found across these products include side-on camera angles, realistic lighting, looping animations, and music playing an important role. Aspects he plans to include in his own work are the art and animation styles, color palettes, concept from Mortal Kombat, soundtrack, and using color theory and character-specific backgrounds.