As it stands, 2013 isn't looking like a particularly stellar year for games based on the Aliens franchise. Alien vs. Predator: Evolution is not quite the high-profile disaster that Aliens: Colonial Marines was on other platforms, as it does a valiant job of creating a longer-form brawler for iPhone and iPad – but the game is sadly plagued with consistent crashes and occasionally infuriating mechanics. Somewhere under the problems, there may be a really enjoyable title here. But without some polish, Evolution will remain a mediocre allusion to a beloved old PC game.