Tower of mobs

My idea is to generate randomly all over the biomes in Minecraft some towers where the player could fight with mobs and hostiles creatures. It could be like the tower in the anime Danmachi (Is it wrong to peek up a girl in a dungeon) Like you go up room by room after one another with different mob every time with spawner and etc. There could be a reward for every 5 or 10 room completed and at the end there would be a new boss (or mini-boss) like a Minotaur or a mutant that have different aspects of different mobs.