Mine has just done something weird. There was only one ship of each, and they couldn't get each other. They kept circling around, neither able to shoot the other. It was hilarious at first, but then it just got annoying.
Maybe you should add some code that when there is only two left and about 30 (or whatever) seconds pass, a new group of ships on both sides form (or something to that effect).

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♪Prison gates won't open up for me
On these hands and knees I'm crawlin'
Oh, I reach for you
Well I'm terrified of these four walls
These iron bars can't hold my soul in
All I need is you
Come please I'm callin'
And oh I scream for you
Hurry I'm fallin'♪
Goodbye Blazed Games...