[MrMoke]

Never really happened to me. Most problems with programs are the result of programmer error. Thus the need for QA Teams.
I did notice that the world in Crash01 contained a Huge number of objects. That might indicate that the student was more focused on creating a pretty picture than a functional algorithm.
Adding an large number of objects to a single world will proportionally increase it's size due to the methods, functions, and properties for each one even though they may never be used.

You might want the students to cut the clutter, and focus on logic and code.