So the tricks is that you need to use the cannonball to flip the seesaws and time it all so you don't crash right into the other toys.

If you get going without any hesitation the timing ends up pretty easy.

The boss levels are getting harder... 

Level 8 requires you to dodge the spaceships  shots while you at the same time try to get it to shoot at the reflector so it ends up blasting itself out of the sky...