The Haunted Bookstore

You are a friendly Ghost in a Bookstore.

There are four customers left in the store. Please help them find the books they are looking for.

While you are invisible to them, don't let them see any levitating books! They will get scared and never return to our store.

Oh, and please don't fly through any of our furniture, the ectoplasm is really hard to get rid of. Thank you !

This is my entry for the  LOST CARTRIDGE JAM '21 How you play: