Final Defence: Landing!

Final Defence: The Beach is a first person shooter (FPS) game in which you play as a defensive general.
The war is urgent. Your comrades are dead, now the enemy has organized a wave of offensive, please hold your position.
The enemy has infantry, tanks, aircraft and other military units, and you can use different weapons against them. Slide the screen to aim, Click to fire and you will shoot.
We will throw you some medical kits, please collect them in time. If the enemy is too strong you can also use one-click reinforcements to call us, we will immediately reinforce you!

How to defend:
You can shoot the enemy with a rifle.
You can shoot tanks, transport ships with grenades.
You can use RPG to fire at local air forces.
Please do everything you can to protect this position from enemy invasion.