I'm sure you've played or Google-researched a bunch before making this game, but one of the best links I've found when designing my own space-combat systems is:
Starship Combat News - The latest info on space games and miniatures
I'd especially recommend the following to see what other people have done:
Full Thrust - Been around forever, basic and advanced rules to cover all the bases
A Sky Full of Ships - Great for huge-scale conflicts, ships have just enough stats to be differentiable, and few enough that you can play 20 ships a side.
Starmada - Another oldie, comprehensive and well-play tested combat and ship construction rules. Ships are tough and slowly get crippled as combat wears on.
Also, Generic Space Combat 2 here:
Generic Space Combat 2
These are mostly minatures-based combat systems, but there's lots of good ideas between them.
Downloaded your game too to give it a read-through. Hope you find some of this useful!
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