Protect the campus

This is a first person shooter,A school is occupied by enemy forces and players can explore freely to familiarize themselves with the school's terrain,Players need to be careful to avoid enemy attacks or kill them.Players need to stay alive as long as possible.
Control keys:
Right-click targeting
WASD movement
The left Shift running
Left mouse button attack
Space leaping
The left Ctrl squats
Mouse control direction
R Loaded Weapons