INVASIVE SPECIES
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Eradicate the critters then find the exit, some creatures will have to be dispatched in colour order 
and may take several hits, others need to be pinned down before they will die.

You also have to kill the plant/flower that grows from the ground.

In order to properly complete the game you need to collect all the diamonds.

A diamond is awarded once a screen is cleared of all the creatures except the dark blue ladybirds/aphids.