Use arrow keys.
Heart drawing was found on https://www.google.com/search?q=undertale+heart&tbs=sur:fc,ic:trans&tbm=isch&source=lnt&sa=X&ved=0ahUKEwib1tapgJDgAhWFN30KHUE8B5UQpwUIIQ&biw=1280&bih=650&dpr=1#imgrc=ZpL9YtAcOy5xwM: under reuse. Art is not mine.
