Can I Become Stronger by Eating Some Garbage at the End of the World?

The day after the zombie outbreak, the system awakened! "However, it seems that the system is not fully functional?" "Zombies evolve so fast!" "But why is it a Cthulhu-style thing?" "Humans evolve so fast!" "Damn! These are the protagonists, right?" … "Is that a mecha? When did technology develop like this?" … "Let's make a team together!" … "We can't stay here any longer, I feel something is wrong!" … "Let's build a base too!" …