The only thing about it is, if you end up killing off so many units that you don't even have enough to bring the maximum number of units to a chapter, the game gives you generic units to fill out your roster. To get most of the bonus chapters, you need to have 15 or fewer units, and there are a number of chapters where the number of units allowed is above 15, so if you try to get the bonus chapters, be prepared to see a lot of generic units. (And generic units count towards your total of 15, so make sure to kill them off right away.)
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Ulti (in one of his Post-Contest Analyses): God of War turned a 5 hour deadlock into a total laugher
Anagram: Oh God, Tidus and Yuna were involved?