Dungeon Master: Paving a bloody path to sovereignty Dungeon Master

*The image on the cover belongs to TheSmilingOgre, I claim no ownership of it
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An unknown entity has kidnapped hundreds of thousands of humans across the whole globe and transported all of them to a fantasy world. There, they were all separated into two different roles: Dungeon Masters which have to expand their dungeon and kill any intruders in order to grow stronger and Heroes which must enter the dungeons to destroy them.
In the midst of this bloody game, Luiz must do everything he can to survive as a Dungeon Master while learning more about the fantastical world he's been thrown in and the entity that brought all of them there.
So accompany him as he rises to the top and leaves a bloody trail behind him as he aims to become unmatched by all.
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*English isn't my first language, so feel free to show me any errors so I can correct them in the future.
*This is a very slow novel, so there will be a lot of descriptions, theorizing and experimentation when building the dungeon, so if you want a lot of action at the start you might be disappointed but if you like an in-depth dungeon building and a flashed out fantasy world than you might be interested.
*Romance will be entirely absent from the start of this novel as it would make things progress even slower than they already are, but I'm willing to work on it later on.
*The protagonist won't be an OP badass who can solve everything easily but he'll be very thoughtful and will always try to outplay his opponents rather than just facing them head-on, basically he'll have the ingredients to be very powerful at the start but that will only come true later on.
*Lastly, make sure to leave suggestions and tell me how you feel about the story, your opinions can help me greatly in writing this story.