The scary shivery feeling is created by describing the feeling of goosebumps and shivers that we get when cold breeze goes past us or we're scared or something similar. In addition, chipmunks and owls are natural enemies since owls hunt them at night so it's another addition to the scariness.
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The writer that greatly influenced Jane Austens's work was Samuel Johnson, which is known for his witty works. Like him, her novels are concerned with issues pertaining to morality. Also, Austen's work are known to make fun with cliches such as love at first sight, primacy of passion, etc.