Heat oil in a large frying pan over medium-high heat. Add garlic and sauté until softened, about 1 minute. Add shrimp and cook, stirring, until pink and just cooked through, 2 to 3 minutes. Stir in lemon zest and juice, parsley, salt, chile flakes, and pepper, then mix in pasta to coat.
Note: Nutritional analysis is per serving.