Interesting concept! Also, love the sound effects and the animations of the ghosts. They feel like funny chubby fish to me, in a good way!
I do think that having some control over what ghost you could spawn could be neat? It wasn't too big of an issue, but I did have some moments where I had to repeatedly die and hope that the right ghost spawned in.
Besides that, mixing the ghosts is a very cute mechanic and it's fun guiding the one ghost you need whilst avoiding the others!