Well, I won. The insects actually helped quite a bit, although it's obvious that I did most of the work.
The costs for the war were enormous; I could have colonized a lot of planets instead... But overall, it turned out pretty well, just for fun. I captured two planets, including the capital, and gave the remaining one to my ally.
And yes, the rest of the army will be useful – I'll use it to destroy all sorts of crystalline organisms and space amoebas.