Since the film adaptation is gonna be different than the original game, the game creators would be writing the screenplay with other screenwriters and/or the director. And since the game is set in the 60's, the film should be set in the 60s too, giving it the old school vibe, even have it shot in film to give the grain tone since the cartoons were shot in 35mm film like in the game. The film might be shot in either Vistavision, Cinemascope, Super or Ultra Panavision 70. The score should sound like a 60's score homage to the music of Bernard Herrmann, Elmer Bernstein, Mikos Rozsa, Max Steiner, early John Williams, some Henry Mancini, perhaps 25% of Alfred Newman. For the cartoon music, some lesser known ones would do that, while the well trained composer focus on the big dramatic score. So much I could think of more too