Cook pasta in very salty water, drain and set aside. Cook bacon over medium heat in a nonstick skillet; set aside.
In same skillet, cook 2 diced yellow squash until just tender, about 5 min. Add 1 pint grape tomatoes and heat through, letting tomatoes get a little charred.
Toss everything with cooked gemelli pasta, season to taste with extra salt, pepper and Parmesan.