Gratuitous Space Battles: The Parasites Windows, Mac, Linux game

The parasites always go too far, they never did get the idea of mutualism and they never have pets (for long). So now they are venturing forth from their adopted home planet and in search of a cognate species which breeds freely and is able to give birth at least once per year, with a good growth rate and preferably (although a bit of crunch is acceptable) without an exoskeleton. The parasitoid race is no longer deterred by bright colouring of potential hosts as they know from experience that these are sometimes simple dye additives that some races ingest in a rather feeble attempt to suggest they may be toxic. They have had 198 years to upgrade their battle fleet in between breeding and snacking and now want to change the menu. Mmm how tasty are you?