Well, for me the journey was the reward...is that it? just you defeated vader, the end? well that's really underwhelming and disappointing.
You're right, the ending was somewhat fast and irritating, and reminiscent (maybe by the dev's choice)...the ending for Ahsoka in Star Wars Rebels was just as bad as here, 'just use the force void and everything is possible'...
Try 'Orange Trainer' if you're still interested, the slow corruption and the story + epilog of Ahsoka are far better than here.