Have students upload their games and invite them to beta test the work of others. Beta testing is an important step in game development as it allows a fresh set of eyes to find glitches, planning errors, and determine overall playability. Here they can create a scientific report of their findings and possible solutions to send to the original student developer. Visit this link for more information on how to write a scientific report.
Writing reports is a great way to understand processes and work through new findings. They are essential learning methods used in high school and college-level courses so use this as an opportunity to get a head start!