I haven't seen your email yet Lillie, but all of you have been sweating over that yellow timer.
I'll post a spoiler when I get a moment.
Thanks for sticking with it Lillie!
EDIT: I've seen your email, and your solution is nothing at all like mine. Congratulations on finding such a devious way of completing it!
Anyway folks, for anyone who wants it, here's the walkthrough.
Walkthrough
431LIZM – Stinky in the Piazza
1. Slide down and push box up thru red TP. Follow and collect coins. Go left thru TP and get bonus coins. Slide down round the ice, stop the conveyor, go through the TP and down to the red sphere at the other side. Push sphere up thru TP when safe, so other red sphere lands on red button.
2. Grab the coin right of the chomper and lead him round to the ice square. Go up to the cannon area. Push the left cannon down to smash the boxes. Push the right cannon down the trampoline into the green TP and follow it. Collect coins off ice. Tramp left over cannon and push it right. Leave it where it lands.
3. Go up thru green TP and push the top cannon left to above the yellow gate. Slide up to the green button, collect coin and go right thru green TP. Tramp down and right. Push the wooden box left into the water. Follow and push the yellow sphere up, collecting the coin. The other yellow sphere is now activating the timer.
4. When safe, go thru the green TP. Destroy the chomper with the other yellow sphere and collect the bonus coin. The sign says close the red gates. You do this by pushing the barrel left thru the red TP at the right moment. Get the barrel into the gateway right of the red TP and wait until the sphere goes east past the green button. As soon as the spikes are down, push the keg thru the TP. If you’ve timed it right, the red gate shuts and keeps the boulder moving.
5. When safe, tramp down thru the green TP and back again. Go left and push the cannon down to the ice cube, and the red sphere onto the cyan button. Push the left ice cube 1 down, and the right ice cube 1 left. Push the cannon onto the green button. Now push both ice cubes left onto the ice curve, so they tramp up and activate the conveyor timer.
6. Carefully again thru the green TP and down. Box in water, step into hidden TP in wall. Collect coins. EXIT.