Thank you so much for the feedback and consideration! Based on your notes I've already come up with some improvements and corrections for the book. Your playthrough made me smile, especially when you "devolved in to little kid play." Definitely intended!
My thought process in creating this game was not only to provide a little game for kids and parents, but also to provide something fun and light-hearted for adults to play as a therapeutic experience.
I loved seeing the creativity of the arena being built, and I hope to see more of that from others who give it a go. The rules would be a lot less overwhelming with a group, especially the individual soul heart dice pool actions. One person keeping track of everything is definitely a recipie for "I'll just roll dice and do what I want" which is absolutely fine as long as it's fun. If you wouldn't mind, please DM me if you have additional thoughts so I can give them the consideration they deserve. Thanks again!