Retro Wave
There is a musical style which reinterprets the 80s: Synthwave or Retro wave. In design, it takes on the aesthetics of that decade in an exaggerated way, based on the the late 70's Cyberpunk and using the representation techniques that did not exist in those years. You can adjust the search looking for Retro Wave Skyline
Source youtube
Also Flat 2.0 design, adjusting the search within this style by adding neon.
Source freepik.com
Related question What is the name of this surreal/minimalist style?