Positive: The Story and humor ( lots of Lord of the Rings references), the gameplay is weird with stealing soul energy from heroes and increasing the dungeons appeal in order. Balancing between soul energy and dungeon appeal can be challenging. Since gameplay is mainly focusing defense there isn’t anything outside of the story mode.
Negative: Increasing the dungeons' appeal delays being able to harvest soul energy at a good rate. The gameplay also limits repayable as all they can really do is survivor mode.