Interesting concept but beyond buying all the stuff to make your character look the way you want, there's nothing else really to do it seems.
Would love to see something more quests or more secrets like the demon girl, just some thing to keep you interested beyond character creation.
Some actual scenes of the characters doing stuff either still photos or preferably animated (yes rather difficult when you have the level of character customization that this game has) but would be nice. could make the scenes more pov like if the customization proves to be annoying for scene implementation.
Just some ideas, but really good start