Endless War, but I Can Level Up Without Limit

Li Liang was an ordinary young man, until he woke up to find himself in an endless, frenzied battlefield.

A boundless land already reduced to scorched earth, where countless lives and worlds burned away every second, and a technologically advanced human civilization where everyone fought for themselves.

There was nothing here but war, endless war. Humanity fought to the death against countless powerful foes from across the multiverse.

No peace, no compromise, no diplomacy, no hope... Here, loyalty and betrayal were meaningless. There was only a desperate struggle to survive and destroy, while humanity and the world were twisted by madness, despair, numbness, and war.

Endless swarms of insects, machines bent on exterminating all life, higher-dimensional calamities that destroyed everything, surreal beings that twisted concepts and reality... Millions of kinds of enemies to choose from, and billions of disasters lurking everywhere. Each enemy outnumbered your bullets by an astronomical margin, and each was enough to plunge you into utter despair.

This was hell for the strong, doomsday for the weak, a crucible for civilizations, and a stage for extinction. Everything here dragged everyone down into the abyss without discrimination!

But...

Li Liang discovered he might have a cheat. What do you mean, killing enemies lets me level up? I can change classes, too? Upgrade my skills?