Simple but nice
Great game, I found the 'simple' graphics give an special feel to this game. I hope the sequel (presuming I interperted the ending right ;)) also has allies that help you with the fight.
I do think that with the Pow missions you need to set a minimum requirement amount of pows that need to be rescued, but make it slightly easier to pick them up at the same time.
Maybe you could give the carrier some escort or arnements so it isnt a complete sitting duck, also add some more threats to it (subs maybe?)
Keep up the good work.