I played another hour of the game today on my lunch break, the start of File 03.
At first I was like "this game is somewhat light on the RPG elements outside of me role playing as a character in the game". Turns out, you just have to get through the first part of the game before things really start to open up. Now I'm able to sell my scrap inventory, upgrade my weapon and legion kit, spend upgrade points on my legion itself to unlock new active and passive abilities, take on photo challenges, wash your legion (wtf), and tons more.
Me and this game are going to get along just fine.