Everyone has a different spice level tolerance, so it’s hard to predict what you will find to taste spicy. I’d say this pasta recipe is a mild spice level. If you like Frank’s or Cholula hot sauce, this is a similar spice level. If you prefer barely any spice, reduce the amount of red pepper sauce. If you are spice obsessed, increase the amount of red pepper flakes by an additional ½ to 1 teaspoon.