Tip: When determining a time limit, remember that players won't be as familiar with the level as you are. If you normally complete the level with around 100s left on the timer, others might run out of time on their first try.
Quite long, focusing on platforming, puzzles, and of course, P-switches! Yoshi can be taken into the bossbattle (with some effort), however, it is not only a bit tricky, when you do, Yoshi looks a bit glitched and will despawn if you take damage or jump off.
There are some errors in the level, but I'm sure you'll be fine.
Also, the part with the Big Mole and the Koopas IS POSSIBLE without taking damage, I did it myself. If you can get Yoshi over here, it's a lot easier.