Prepare biscuit base: In a chopper, add biscuits and process until finely crushed. Add melted margarine and process until well combined. Press the biscuit mixture firmly into the base of an 8-inch loose bottom pan to create an even layer. Refrigerate for 30 minutes until set.
Prepare mango cream cheese mixture: In a bowl, whisk together cream cheese, yogurt, caster sugar, and vanilla essence until smooth. Add 1 1/2 cups mango puree and mix well.
Dissolve gelatin for cheese mixture: In a small bowl, mix water and gelatin powder. Microwave for 20 seconds to dissolve. Add 1 tablespoon of the mango cream cheese mixture into the dissolved gelatin, mix well, then add this back into the main mango cream cheese mixture and whisk well.
Fold in whipped cream: Whisk whipping cream until soft peaks form. Fold the whipped cream gently into the mango cream cheese mixture using a spatula until well combined.
Assemble cheesecake layer: Pour the mango cream cheese mixture over the biscuit base in the pan and spread evenly. Tap the pan a few times to remove air bubbles. Refrigerate for 1 hour.
Prepare mango jelly layer: In a jug, mix 1 cup mango puree, caster sugar, and lemon juice. In a small bowl, mix water and gelatin powder and microwave for 20 seconds to dissolve. Add the dissolved gelatin to the mango puree mixture and mix well.
Add jelly layer and chill: Pour the mango jelly mixture evenly over the set cheesecake layer. Tap the pan a few times and refrigerate for 4 to 6 hours until fully set.
Decorate and serve: Decorate the cheesecake with mango cubes, cherries, and mint leaves before serving.