First of all ...Thanks all for the coments!
We participate in the jam as a project with my students to create a game from scratch using a brainstorming based on the jam theme. As we learn the test phase is very important but we hasn't enought time to this phase. We are learning a lot with this experience and we want to continue developing more interesting levels for this game in the future
I put a more playable (and tested) version in this URL: https://creacionvideojuegos.es/proyectos/separation/index.html
I would appreciate any comments you can make and that I can pass on to my students. (Of course, this version cannot be taken into account for the contest to respect the rules)
Thanks to all... I will review all your games ;)