There's no special order to it. The trick is to kill 2 monsters of the same color in a row. For example, if you kill a red monster, you must kill the other red monster next. If you kill a monster with a different color after the first red, the first red will be revived (by the second red one or something). It may require some thinking and planning even when you know this, but it's not really that difficlt. There
is a hint somewhere on the ship that explains this, that's how you are supposed to find out how to solve it, but you have to search for it