An amazing rpgmaker game with a cavalcade of content. This is on par or even better than the likes of LISA as far as testing the boundaries of what you can do with the engine's combat system. Seriously a lot to do here, 30 hours is the low end if you're trying to experience most of the side content.
Story-wise it's definitely good, when keeping in the context that you're experiencing the dream world how an 8 year old would. The music is fantastic. The sprite work is definitely rough around the edges even going for an earthbound style, but consistent in style and direction. A lot of the elements of the game really fit together to create an experience that's much more than the sum of its parts.
The only thing I find myself wishing upon reflecting over my dozens of hours with the Jimmy is that there were a few more transformation puzzles. Also this is certainly on the more challenging end on rpgmaker games so be prepared for that.