Really cute art and love the fact that you have to draw the symbols to perge the ghosts, very creative! Maybe it's just a me thing, but I don't think looking around the ghosts adds much (I know it helps fitting the theme of the jam) and if you want to continue working on this after the jam I would probably change it to just a click on the ghosts , or for example making the symbol would send a shockwave that defeats ghosts on touch.
Either way, good job!