Combine in medium saucepan 1/2 cup of sugar, cornstarch, jello, lemon juice, and water.
Cook over medium heat, stirring constantly, until mixture comes to a boil and thickens.
Set aside to cool slightly.
Stir in sliced strawberries.
Tear angel food cake into 1 inch pieces and toss with 2 cups of Cool Whip.
Press into 9x13 pan. Set aside.
Combine cream cheese, 1/2 cup of remaining sugar, and vanilla in mixing bowl. Beat until smooth.
Poor cooled strawberry mixture over cream cheese layer, spreading to cover cake evenly.
Refrigerate 2 to 3 hours.