Click on the screen to launch bubbles.
There are 4 steps in launching, just hold the mouse on the screen, then the bubble will charge.
Step 1 has only 1 bubble to release.
Step 2 has 4 to 8 bubbles.
Step 3 has 8 to 16 bubbles.
Step 4 has 32 to 64 bubbles.
Speed and angle of release will also vary on how you charged it. Of course full charge should be the most satisfying (in my opinion).
Although I have't fully tested it yet, I believe this will also work on mobile devices.