Arrange cake slices on bottom of a rectangular 11x7 inch baking dish, cutting cake slices if necessary to fit the bottom of the dish. Drizzle coffee over cake.
Beat sugar, chocolate syrup, and cream cheese in a large bowl with an electric mixer on medium speed until smooth. Add whipping cream; beat on medium speed until light and fluffy. Spread over cake. Sprinkle with chocolate-covered toffee candy.
Spread frosting over cake. Sprinkle with toffee candy. Cover and refrigerate for at least 1 hour, but no longer than 24 hours to set dessert and blend flavors.