For what's provided in this singular level, it's really, really good. The Dry Bones enemies are really interesting and a lovely surprise, the two player star was something I've always wanted to see in anything made or ported to coop, and the detail in every corner of the level is perfect.
The music was pretty basic though, only sticking with the BBH track, and i think adding some better lighting to the level would make me feel more immersed, although I can understand keeping the standard lighting for Mario.
I'd love to see more levels like this, would recommend if you're looking for a short, sweet level to awe at.
