Though this aspect is often ignored, a video game needs a good soundtrack to really get the player involved. Even Super Mario Bros. thrived on its music. Now more than ever, the era of cheap, meaningless, ambient music on repeat is over.
It would make sense to snatch some tracks from the movie, but expanding the soundtrack for the Suicide Squad game would be a wise move. This is a movie starring real people in a modern world, not a medieval fantasy. It needs actual music by actual musicians if it's going to seem real.