Spiralize the zucchini, then spread the noodles on a towel and sprinkle with a pinch of salt for 10 minutes. Pat dry; this stops them going watery.
Pat the shrimp dry with paper towel. Thinly slice the garlic.
Heat the oil in a large skillet over medium heat. Add the garlic and chili flakes and stir for 1 minute until fragrant but not brown.
Turn the heat to medium-high, add the shrimp in one layer and cook for about 1 1/2 minutes per side, until pink and opaque all the way through. Tip onto a plate.
Add the zucchini noodles and cherry tomatoes to the pan and toss over medium-high heat for 2 minutes, just to warm; longer makes them soggy.
Return the shrimp, add the lemon juice, parmesan, parsley and salt, toss and serve right away.
Tips
Do not overcook zucchini noodles; they turn watery.