Those "repeated certain melodies across the movie" have a name. It's called a theme and is something that's pretty common in movies, opera, musicals, symphonies, etc. An entire work can have a theme that is modified, built upon, expanded or changed as the narrative progresses. Individual characters or places can have their own unique themes. Daft Punk's entire style is built on repetition, so it should be no surprise that their musical score work would highlight that.

https://simple.wikipedia.org/wiki/Theme_(music)