Here is my guide to kill Cyrax(Final boss)
Cyrax will summon small Sylv(the blue one)(acctual name Sylvester)
Kill these quickly.
When a big alien appear, kill it unless it is type-D (destructor,shoot 3 missles at fish)
Destructor will shoot fish which the missles can be avoided.
If you never get destructor, just kill the aliens as you see.
Here are the tips on killing the following
Sylv and Balrog (Blue and Yellow)
Just shoot, they die fast.
Type-G (Gus)
Same as Sylv and Balrog
Type-P (Pychosquid)
Bring him to a corner, when blue, shoot him to steer away from the fish.
Type-U (Ulysses)
Bring his missle to an edge when it is near any edge or repel it back to him.
Note: Cyrax WILL NOT BE HIT by the missle.
Type-II (Baliterus)
Two heads, not a trouble if you can make him to go to a corner.
Hope it helps
Record: 12/18 pets saved.