Hi! I read a few chapters of Ghost-Man(a few earlier chapters and a few later chapters to track any improvement), and I have some suggestions that might be helpful? I'm not a novelist, so take all my critique with a grain of salt!
First, the concept of ghost-man is super interesting! You have a great concept with fun comedic undertones that also leads to some great action. I can see the vision you're creating for the readers, and it's quite clear! I think there are just a few things holding the story back from reaching it's potential.
The idea of showing vs telling can be a little tricky to navigate. Right now, it feels like a lot of information is TOLD to us by Ken rather than the reader experiencing these moments ALONGSIDE Ken. It might be partially due to the fact that you mostly use past tense first person rather than present tense first person. Past tense first person has been done before and can be effective, but that's usually when there's a sense of remembering a period in time or re-telling a story.
I think adding more details and expanding moments within the story would also help flesh out the characters more and help with that concept of Show vs. Tell. I see that you write with a specific trajectory in mind, but trying to rush the plot along to more important points will do more to hinder the story than to help it.
The way that a lot of dialogue heavy scenes are written right now seems rushed. We don't get a sense of pacing and emotion because the readers are constantly jumping from line to line with no breaks. It can also be quite difficult to figure out who's speaking without tags (ie Ken says, Harper says between giggles, etc.) Dialogue can jump from line to line, but it has to be extremely clear who is speaking and it usually doesn't last more than a few lines at most.
Overall, Ghost-Man is fun and it has a great sense of adventure and shenanigans to it. Don't be afraid to go into more detail about the world and moments the protagonist lives in. I'm always of the camp that writing too much and deleting is better than writing too little and having to do more. You should be proud of this work, it's got a lot going for it!