Cook the rotini pasta according to package instructions until al dente. Drain and rinse under cold water to cool.
In a large mixing bowl, combine the cooked pasta, sweet corn, diced avocado, cherry tomatoes, red onion, and cilantro.
In a small bowl, whisk together the olive oil, lime juice, garlic powder, salt, and pepper.
Pour the dressing over the pasta salad and gently toss to combine, being careful not to mash the avocado.
Chill the salad in the refrigerator for at least 30 minutes before serving to allow the flavors to meld.