My god the polish on this game is awesome. The sounds effects, the animations in the menus, the transitions between scenes, the may the menu subtlety moves around relative to your mouse. Everything was a feast for the eyes and the ears.
I am one of the few people who really liked the 9s hacking mini game sin Nier Automata so this game's game play was also a treat.
My only criticism is that picking the different difficulties every round felt a little arbitrary. So maybe have more different kinds of rewards (like upgrades and stuff in roguelikes) rather than just raw higher score numbers.