Not tapping but touching and releasing timely. When near a gear, you touch the screen where our spider hooks into that gear and starts to rotate around it. Once you release your finger, it flys off and you need to hang into the next gear, that's all. Ofcourse, all this action is within the real world physic. You can also tilt your iDevice to push the spider left/right while in air and in bubble.
The video is not actually a trailer but just a quick preview as it's name implies. I didn't have much time to put up a real trailer. Working on multiple updates and games at the same time and being one person doesn't help much

. In the video, you see the basic game mechanics in the first few levels which is just practicing your skills. In later levels, there are lots of surprises which some of them are shown in the screenshots like Bees, Spikes, Fish, Bubbles, Trampolines. For example, in some levels when you land on a bubble, you control our spider left and right while our spider goes up to sky within it. Trampolines are used as launch pads to reach some distant gears.
With never seen mechanic in an Appstore game, I can assure you that it's pretty fun!