When I started using it with students Google Slides was a very basic slideshow creation tool. Over the years it has evolved and new features have been added. In fact, at one point there wasn’t an option for building-in transitions or animations. When those were added they were still rather basic.
The latest update to Google Slides introduces more animation options. Now you can have objects simply appear or disappear in your slides on your click. Previously objects had to fade or fly in or out. Speaking of the fly in option, you can now set the direction from which objects fly onto your slides.