First, I would like to mention how much I loved the visuals. I still remember the first of your games I played, and while the visuals caught my attention and were quite unique, they were still pretty rough. However, you kept improving you art with each new game, and this one is, in my opinion, your best looking game so far, specially in terms of sprites. Seriously, the style, the art, the sprites, the backgrounds....I loved all of them. Your animations have also improved greatly. But overall, in terms of art, this is one of the best looking games I've played in a while, and definitely one of the most unique ones too. Your style is pretty recognizable, and in a really good way.
The concept of the game is really neat, and the gameplay didn't feel repetitive to me, although maybe that's because I'm a fan of everything related to ghosts. I actually felt relaxed while playing and I would have loved to have more stages, maybe with more characters. Still, the lenght of the game is good considering it's for a jam. Also, I want to mention how much I like your tutorials.
The music was really goood, really relaxing and that's another thing that you've improved greatly. I thought Invasive Species had the best soundtrack, but I think this one might dethrone it.
I don't really have something to complain about other than what I mentioned about more stages and more characters, although that's more of a personal wish than a real critique, since the game didn't really need that in order to tell the full story.
So yeah, overall, a really solid game with beautiful visuals, and definitely one of my favorite entries!