The challenge of the game is something we never got quite right. The suitors are too easy, and Yukari too hard. Since you seem interested, I will tell you how the True End works- but BIG SPOILERS for anyone who hasn't played yet- To unlock the true ending you must handle each of the suitors amicably and then convince Yukari to leave Reimu alone. The trick there is each of the Bad Ends with the suitors teaches you, the player, the best answer to one of Yukari's questions. Since the jam ended I have gotten several better ideas to handle the decisions but they would require a complete rewrite. I will save them as lessons learned for the future.