Mostly because japanese games directly appealing to animu fanbase are either adaptations (meh) and harem moeshit, which is as loved as hated.
Psycho Pass or Ergo proxu fans would be attracted to Deux EX over Tales of franchise, for example. The japanese AAA scene is also extremely influenced by Final Fantasy and Resident Evil, which takes root into US movies more than japanese pop culture.
The games that would appeal the most directly to the animu fanbase would be Visual Novels, but they are not well known in the west and requires reading, which animu fans hate, or they would start reading manga lol.