This game is just bullshit, it's not even fun. Just spam Peasants or Archers and Gold mines and it's impossible to lose. Literally impossible. It's like Rock scissors, no paper involved. Rocks are pesants, and the metal scissors just fall under the dents the rocks make.
To get 15,000 points is not easy. The easiest way I've found is to mix tortures. First, give him 7 shots of adrenaline. Lower the temperature to 0 degrees. When you have done this, the hard part comes.
All at once, you have to compress the room to within an inch of his life, hold down Q, and put in as many bees as you can. Wait until his HP is as low as possible (Like 5-20) then click on scarabs.
This combo will get you up to 20,000 if you do everything perfect. My first try I got around 13,000, but it's easy to get 17k after you practice a little.
Tip for brand new players. Start your first game. Don't change anything, just press start. Immediately die. Do this 5-10 times. You're guaranteed to get a least a few good starting titles in very little time.