When using the Gunyip , the game switches to a scrolling shooter ( similar to Gradius ) .
When using the Chopper , the game becomes a top - down action game ( similar mechanically to Solar Jetman ) .
When using the Gunyip , the game switches to a scrolling shooter ( similar to Gradius ) , and when using the Chopper , the game becomes a top - down action game ( similar mechanically to Solar Jetman ) .