Apocalyptic Tower Defense

Miao Susu had a dream, in which the end of the world was coming and monsters were raging. Fortunately, humans have the ability to build safety towers and are barely able to gain a foothold. After she woke up, she kept thinking about her words and deeds in the dream, and the more she thought about them, the more regretful she became. Who would have thought that when I woke up again, the end of the world would really come, and humans would really be able to build towers? The only problem is that the grand and domineering security tower in the dream is just a thatched house at the beginning. Intention: Never give up