Publishing Android game for educational purpose

Hi Guys, I'm teaching "Promotion and Marketing" on Technical University of Lodz - our students want to create (completly) free 2D Android game and publish it on Google Play (using our university developer account) - as a result of project task.

Is it legal to use Unity Free in this case and publish free game?

Thanks for answer,

http://forum.unity3d.com/threads/203961-License-Publishing-Android-game-for-educational-purpose