I think you should add more design (such as bg) and give it a more levelish feal.
Maybe you could make it simular to one of your "pop them auto"s, exept time the placement of the bubbles to hit every few seconds. But thats just a suggestion, you can do what ever you like.
I think you should add a way to prevent cheating, as you can skip the entire thing in one jump, and speed up the tutorial, as it currently moves very slow. Msybe you can also add a short level at the end that shows this teqnique used in a level?
I think you should add more design (such as bg) and give it a more levelish feal.
Maybe you could make it simular to one of your "pop them auto"s, exept time the placement of the bubbles to hit every few seconds. But thats just a suggestion, you can do what ever you like.