whats killing you exactly, the apes? they can be tough, you just have to learn to stay back when they are doing they're attacks.
i think you can just run though a good part of this level, but you'll want to figure out how to kill the apes because its going to get harder towards the end.
its not really that hard on Normal though. you probably just need to put some more time into it, master yourcombos and avoid enemy attacks better.