Tower Of Wishes

What is this?
This is a novel though by me and is supposed to be an original one.

A summary of the story?
In a relative distant future a group of mercenaries is hired by a researcher for explore a mysterious island appeared near the spanish coast.

The group is able to enter but one after another die leaving only the head of the group that, injuried, reach the end of the tower.

Inside the last room the head of the group encounter a strange entity that let him reborn saying that such thing is part of his wish.

The genre of this story?
Well, the genre is mainly:


 * Adventure
 * Some slice of life
 * Some management
 * Fantasy
 * Harem, but nothing big