Oh hey! A fellow witch game dev! I love the cute retro pixel look of the game! The story intrigues me. I would love to learn more. Perhaps the main character can finally wear that title screen witch hat in the gameplay? :) I will admit, I was intrigued when one of the blue ghosts mentioned blue represent good. made me think that blue ghosts are friendly and other colored ghosts are not... maybe even as potential enemies. But as it is, nothing came of it. I can't even talk to the pointing grey ghosts. I will admit when I saw that blue ghost holding the down sign for the first time, I thought it was meant to tell me that I can hold down for a super jump. That's on me. though I admit that be cool.
But... it saddens me, but I must give critiques. For starters, the story doesn't feel complete. I understand leaving mysteries, but that alone doesn't give a satisfying story if it doesn't have a beginning middle and end. I'm not expecting much. Just a little more clarity on the head space the mc is in at the start. for the middle of the story, some clarity on her journey and why she is doing this. And for the climax, where she meet the entity at the end and the reveal of what this entity means to her. all this can be done with simply more dialogue. either as inner dialogue or just more ghosts to talk to. and as i said, it be cool to talk to or interact with different colored ghosts. Like red or grey ones for examples.
Another critique I have is slightly harsher. the limitation is enemies as weapons, and yet the ghost aren't really being used as weapons here. Just support. I know you said your implementation is the girl getting help from the spirits, but I feel that can be pushed further. maybe the girl can call the ghost to attack hostile ghosts? Something simple that goes along with what you are going for and supports the platforming gameplay. Because as it stands, I love the ghost concept.
Overall, I'm left eager for more. I want to see the main character speak and show her personality. I want to character to actually show off her powers as a which beyond just ghost whispering. and to put on her nifty witch hat!And I would love to learn more of the witch's relationship to her family. If it helps, what i do for game jams is that after the voting period is over, I spend the week between mini game jams to polish up my game entry and release a post game jam patch before the next game jam starts. it's a good way to practice and add in the things you couldn't add because of time. And experiment for future projects. Anyways, I'll be keeping tabs on your work and I would love to see more of your story!