Alien Invasion, I Upgraded Alone to Become a God

One day in the future, the game comes to the world, and the earth becomes a place for alien species to attack. Countless "wormholes" appear in the world, which are "doors!". The doors contain various strange races, but there is no doubt that they are all minions attacking humans. Humans begin to resist. Such people are collectively called "hunters". Hunters are divided into levels A, B, C, and D. A is the strongest, and hunters have different abilities, such as nannies, knights, mages... This novel and its characters are purely fictitious. Any similarity is purely coincidental and should not be imitated.