Hi! Thank you for your feedback.
The beta phase was primarily to make sure the stability of the game is in place for Early Access. There was never a plan to have more story added in the transition from Beta to Early Access, but there is a plan to add story from Early Access to Release. We estimate the game (and its story) to be completed anywhere from 2 to 12 months from now.
On the plus side, in terms from Beta to Early Access, we have added about 10-15 hours of Quests and Side Missions to complete, not counting the Unfair Challenges or Versus participation. From what we've seen, it takes over 100 hours to unlock all the items as well. We feel this is more than enough content, so long as you are not specifically looking for the story. If your main motivation is the story, then I can see how you might be disappointed, and I'm sorry for the misunderstanding.
I hope that helps clear up where we're at!