This is stylistically similar to the first game, with many of the same positive qualities, and many of the same flaws. The scrolling, zoom-able hidden puzzles are just as challenging (and frustrating, and messy), the music and art are just as beautiful, and the voice acting is just as over-the-top.
The plot is also just as convoluted (although this one feels more like a campy homage to the classic film "Journey to the Center of the Earth," and less like "we just didn't think this through"). I was honestly expecting the story to be a direct continuation from the previous game, but it does not seem to connect at all, aside from starring the same main character and a similarly-named villain.
I feel like this game had slightly more of a focus on the point-and-click adventuring and mini-games, which helped to add a level of depth and content that wasn't entirely present in the original. These elements were clever and intuitive, and blended seamlessly with the hidden object puzzles to produce a more well-balanced and interesting game.
Overall, this was a fun, sometimes frustrating game that is worth buying on sale. I would give it a 6.5/10