They're all good ideas and I'm already working on some of them, such as the eel and having more enemies. I'll have to see if I'm gonna be able to implement some of the others; maybe with some minor changes
Don't feel pressure! I was just spitballing since I felt inspired. I love that your adding the eel since so many people said that was scary growing up haha. I wasn't one of them, the most scary thing in the game for me was the wierd door designs of the haunted mansion paired with spooky music.