The time limit is not your main concern with this level; the oncoming flood of Fuzzies is. If you’re going to make it through this and collect everything, you’ve got to move quick. The Cat Power-Up and Tanooki are both excellent choices to help make the tough jumps much easier.
Stamp
The Stamp comes right near the beginning. You have to wait for a block to move out of position to reveal it, while dodging the nearby Parabones.
Green Star #1
The first Green Star is underneath a cloud platform, seemingly cut off from everything else. Use a ground pound to smash through the cloud and retrieve the star.
The level stats scrolling to the right here. Stay calm, try to avoid running into enemies as you stay ahead of the Fuzzies flood.
Green Star #2
As the level starts to scroll upward again, you’ll notice a see-saw platform with the second Green Star hovering over the side closest to the Fuzzies.
Green Star #3
With the level now scrolling upward, you might catch an early glimpse of the last Green Star behind a set of platforms that slam shut. You need to use a Jump Panel to launch yourself into the star’s alcove, then use the platforms to climb up and away from the Fuzzies. Mistime this, and you’ll dragged off screen and lose a life. Fortunately, the door to the Goal Pole zone is really nearby.