Heat remaining 1 Tbsp. oil in a large pan. Cook garlic, stirring, until tender but not browned, about 1 minute. Add kale and cook, stirring, until beginning to wilt, about 2 minutes. Add 1 cup reserved pasta cooking liquid, cover pot, and cook until kale is completely wilted, about 4 minutes. Uncover pot, add butter, and stir until melted. Then add cream cheese & heavy cream mix until incorporated. Then add Parmesan and pasta and cook, tossing vigorously with tongs and adding more pasta cooking liquid if needed, until pasta is al dente and sauce coats pasta and veggies, about 2 minutes. Remove from heat and toss in squash, parsley, and lemon juice. Taste and season with more salt if needed.