Gahh, it's frustratingly hard XD
Ugh, I completed it. Took about an hour or more just to complete it. This was challenging and it really got my mind thinking and this point and click puzzle game really needs lots of trial and error. I noticed that the house and coffee machine are kind of useless as well. Oh, and what are we supposed to do at the scene after completing it? Just a bonus level or something?
Well, here's a walkthrough for those of you who are wondering how to complete it. IF YOU DO NOT WANT THIS TO SPOIL YOUR GAME. DO NOT READ.
First, click on the mole beside the right tree until it's right above the Steam lever. Click on the lever, then click on the mole. Now click on the NUTS machine at the top-left corner of the building. Click on the elevator at the top floor. Click on the left phone on the first floor.
The ambulance will then make its way. Then click on the right cloud until it strikes the house and brings the fire engine. Click on the left tree to bring the animal to the right tree. When the fire engine reaches, click on the fire engine, and that will send the animal flying into the vent. Next, click on the thing on the top-right (Don't know what that's called :P). That'll make the guy in specs walk out of the room.
Click on the vent on the second floor, then click on the elevator. (I'm gonna stop typing click from now on.) Elevator on the first floor. Nurse goes up to third floor. Patient at the right of the third floor. While nurse is going to use the defribulators, click on the switch beside the broom. Elevator.
Concentrate on the two at the second floor. When the one on the right is taking the brown jug, click on him. At the same time, click on the toilet. Doctor with the blue mask. Elevator. When doctor with the blue mask reaches x-ray room, click on the purple medikit inside the x-ray room.
Right phone on first floor. Click on the pipe at the top floor as soon as the guy has an exclamation mark above his head. Guy with blue cap will hang on ledge. Click on the other guy. While he's trying to save him. Click on the cloud. Voila!
If it doesn't work, check your timings and everything. Enjoy :)