I recently saw this image and I wondered what the style is, and how I would go about making it.
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 New Wave, using and digitally adapting the representation techniques from those years: airbrush, masking, fluorescent inks, perspective, orthogonal grids, blur, motion blur, and inspired by album covers, movie posters or Arcade games (Thron). You can adjust the search looking for Retro Wave Skyline
Also Flat 2.0 design, adjusting the search within this style by adding neon: flat neon design or flat neon skyline.
Related question What is the name of this surreal/minimalist style?