If the game freezes, just click inside it (games can get unresponsive if you click elsewhere on the page).
Lock, click, jam and load your way to glory because its time for a Marine Assault! Oblivate the incoming swarm of marines trying to infiltrate your base by shooting them down with your heavy machine artillery! Upgrade your turrets in order to take them out before your base is destroyed! Our fate is in your hands comrade, good luck!