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 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
Source youtube
Also Flat 2.0 design, adjusting the search within this style by adding neon: flat neon design or flat neon skyline.
Source freepik.com
Source Behance
Related question What is the name of this surreal/minimalist style?