Preheat oven to 350 degrees. Spray a 9x11-inch glass baking dish with cooking spray. In a large bowl, combine pretzel crumbs, 1/3 cup sugar and melted butter. Press into baking dish in an even layer. Bake until slightly firm, about 12-15 minutes. Set on a wire rack to cool completely.
In the bowl of a stand mixer fitted with the paddle attachment, beat the cream cheese and 3/4 cup sugar on medium speed until smooth and fluffy, about 2 minutes. Remove from the stand and fold in 1 1/2 cups Cool Whip topping. Spread in an even layer over the pretzel crust and refrigerate.
Place Jello in a medium bowl and pour over boiling water. Whisk until jello has dissolved, about 2 minutes. Stir in the cold water and vodka. Let cool to room temperature, then pour over the cream cheese layer. Refrigerate until jello is set, about 6-8 hours.
Cut into 1-inch squares. Place remaining 1 cup Cool Whip is a pastry bag fitted with a large star tip. Pipe dollops on the squares and top with chopped strawberries.