The design is good, it's a shame it's so hard to play, the fact that the time is so short and I can't put enough enemies in the dungeon made me lose several times because the hero passed by in the rooms and when I manage to kill him It doesn't tell me that I won or anything :(, I think it's a bug, very sad.
One thing to keep in mind is that it has a strange delay when trying to select the cards, so it takes me longer than normal to be able to put the enemies inside the dungeon