This is a moderately long level - long enough to earn the tag "huge level" yet comfortably short enough for most people who aren't huge level enthusiasts. As with most huge levels, there is no save point anywhere in this stage, so if you die once, you are starting over.
Most of the rooms have a puzzle emphasis. Some are no-brainers, such as grabbing Yoshi and ditching him to get over a wall. A couple others are twin item puzzles where you are required to find two items to make it through. There's nothing terribly complex and it mostly comes down to seeing where you need to use the items and then retrieving them to get past the obstacle.
There's one serious issue with this hack, and that is in the first cave room, where you can get stuck inside a wall like this.
The Bowser chase at the end marks a huge shift in style to fast-paced action. What feels weird about the chase, which is well-executed and has variety in obstacles you encounter that feel like they may trap you, is the fact that the clown car's propeller isn't even spinning. So, you have this great escape where you're saving Yoshi's unborn children from being eaten by this hideous turtle, except the evil enemy is like a prop from a cheesy 60s monster movie.