I don't care about shadows !
It's not what makes a game , even simple blob shadows under characters and ennemies will work great .
And It's not A7 that makes the scene beautifull , but the 3D art, will one day all programmers will understand that

??
What will make the game shine is gameplay and some more quality ennemies.
The heroine is a great model, even if we couldn't change armor, varied powers and classes would do the job for example.
Personnaly i think you could take , two easy paths :
- A simple hack and Slash but very fun and beautifull, with top effects, with very simple story , a diablo like !
- Action (rpg)game : Ninja Gaiden style (or Bayonetta style) !
with power ups and different weapons to unlock trhought progression.
If you use the shaders you already have with additonnal same quality models and levels you have a winner

!