What device do young people spend most of their day looking at? Harness the pull of the smartphone.
Change the size of the slides so that they fit better on a smartphone screen (for the iphone, its 20cm wide x 10cm high).
In PowerPoint, go to Design > Page setup and change the slide size.
You can set the number of slides as minimum, or ask for them to be submitted before they are exported, so you can check the quality.
Go to Save As > PDF or XPS.
Students could make these for their classmates, which might increase the quality of the work they produce, or make them for students in other classes.