SmallInvaders, Defender II, Invader_Bullet, Bullet II added

9 x SmallInvaders
I-III 1 HP
IV-VI 3 HP
VII- IX 2 HP
Defender life should be 2
Defender II  life should be 3
Defender III (protection) should be destroyed after 2 hits
Invader_Bullets (white, blue, red)
Bullet II (for Defender II)