The visuals for the film are all completely hand drawn and are of the highest quality. The film took several years to complete and is worth seeing for the visuals alone. It helps that the style is fast and cool, like a mix of Guardians of the Galaxy, F-Zero, and the works of Shinichiro Watanabe (Samurai Champloo, Space Dandy, Cowboy Bebop).
Usually remakes suffer in quality in comparison to an original film work but Let Me In is just as good a watch as the original Swedish film Let the Right One In. It helps that Let Me In also employs a precision visual style including an incredible seamless special FX shot involving a car crash. Both films are highly recommended although I slightly favor this remake.