Once you complete these challenges and stuff, you're out of options. There is nothing much you can do to enjoy the game further except doing the dailies and play Slot of Slaughter which gets repetitive and annoying. Due to the server being locked and only few content creators are allowed to play it, I cannot play PvP and CoOp modes.
Upgrading characters and weapons will only give you the ability to quickly kill all of the enemies including bosses. Wish we had 1.0 combat system or a mix of 1.0 + 2.0 combat would be so cool n unique.
I hope we have more stuff to look forward to in the upcoming Open Beta on July 6th.