Gun Master Onslaught 1

Game description:
Your goal is to stay alive as long as possible and destroy the enemy to earn points. Do you have what it takes to survive?  
Game controls:
A / D - Move. W / S - Climb up / down. E - Throw grenade. R - Throw proximity mine. Spacebar - Jump. Left Ctrl - Crouch. 1 - 3 - Change firing modes.