The ghosts are just there to explain what the portal next to them does. I can add some additional explanation to help with that.
I think it's better to change the design of the starting level altogether. It turns out there is a tutorial room, but I inexperienced ran through it and went straight into battle. If you think about it, you can put straw effigies next to the tutorial portal, it will make it clear that there is training. It would be nice to add a magical aura of luminescence to the portals themselves, because they do not look like portals.