Completely unbalanced. Once you get destroyers you can just spam destroyers and artillery guns to an easy win. When you finally get battleships it gets even easier.
Pour all of your skill points into starting resources, then to supply line. In battle, max the supply line, then the salvager, then 1 level of repairman and start spamming destroyers. Took about 3 hours to beat, only to find that the congratulations message has a typo! May the REAL world be paceful indeed!