You may add matte layers between elements just like this:

rocket

Or you may add masks above elements like this:

FilmCamera

Now you can do it at SVGAPlayer V2.5.0.

You can download a sample file from SVGA-Samples to try.

1. Draw a pureColor layer;
2. Select the pureColor layer, add a mask above it;

maskStep

1. Draw a pureColor layer;
2. Draw a masked shape layer;
3. Set the masked layer as a matte for the pureColor layer;

matteStep