Since I did my first gameplay test, I found out that you get the same enemy over and over. The Spider. So this is what I did to fix it. First I made a lot of random chosen enemy's.

Then I made it that the PC chooses a random Hostile enemy, and spawns a copy every random time span. So this will make sure that there is enough diversity in the enemy's. But you can still kill a race if you kill all of that race, that will prevent the computer to make a copy from that enemy.