Cool idea! I wanted to do something similar with mine (updating the stats for the customization chosen but didn't have time). I also loved that certain enemies seemed to be defeated easier with different attacks.
I will say it was a little hard to know which things I acquired in the dungeon so if you continue this project, maybe a little exclamation or something by the pieces you now have. Also, since the player can't actually customize anything at the start of the game, letting them skip the customization scene and jumping straight to the dungeon makes more sense.