Great ideas here! +1
I'd love to see more diversity in how you gain Dark Points as well.
Maybe surprise Dark Monster encounters that occur rarely?
And tablet battles could be a bit more balanced as well (I can't take on OP players and I don't have the heart to loot from the new guys).
The music is good, though you can always add more to it to make it even better!
Keep up the good work! Addicting game is addicting!