Cook the rotini pasta according to package instructions. Drain and rinse under cold water.
In a large mixing bowl, combine cooked pasta, corn, cherry tomatoes, and red onion.
Add chopped cilantro and crumbled feta cheese to the bowl.
In a small bowl, whisk together lime juice, olive oil, chili powder, salt, and pepper.
Pour the dressing over the pasta mixture and toss gently to combine.
Taste and adjust seasoning if necessary.
Chill in the refrigerator for at least 30 minutes to allow flavors to meld.
Before serving, give the salad a good stir and garnish with additional cilantro if desired.
Serve chilled or at room temperature.