Pràctica Final

A spaceship Spawns. But shortly after some enemies spawn to chase it. You have to move quickly using your arrow keys to not be touched by them or their bullets. Luckily you came prepared with a turret, you only have to move your mouse to aim to the creeps. Be careful, the more you leave alive the faster new ones will arrive  called by the enemies. 

How long can you survive? And more important, how many points will you get?