The theme and art style is really cute! Really got me into the halloween spirit lol
I think the puzzles are fun as well! Although I did find it sometimes got a bit tedious to keep having to restart from the beginning if the character got stuck, maybe having a checkpoint right before the player got stuck would be nice? I also think it would be cute to have the bat follow boo around so that the bat is ready if it's needed without having to retrace boo's steps first.
I really liked that you could switch characters and that both of them have different abilities!
Overall it's great game and would love to see more!