I love having students work with slides for the collaborative reasons. They have created some really great projects like a Guitar Timeline! However, it has a ways to go to catch-up to the versatility of MS PowerPoint, but Slides got better with today's update! Google added more options to animations!
As you can see in the image, there are more options for the fly in and fly out with specific directions. Google also added two new animations Appear and Disappear.
I hope you enjoy the new animations and remember to Keep Calm, Click Undo!