I'm sorry that you had a freeze there, I thought that sort of bug was fixed for 1.22. If possible, I'd love to hear what happened around there (you can dm me on twitter) to prevent it from happening again, as you should've been able to click the "what's next..." button to continue. I can also send you the cheat code to have that trial be completed on your save file.
As to what's the "end game", each trial does end in a final boss with some ghost enemies floating around, and afterwards a small cutscene should play.