A lot of people get stuck on level 8, 9 and 10 with this game. Use the game like a clock and don't go so fast when hitting those bugs. You need to go fast somewhat but learn to tap, instead of using force. Once I learned that, I found Whack Off to be very easy. I was stuck on level 8 for the longest time, because I was hitting X, way too fast. All you need to do is, tap X and move L3 and use it like a clock. Don't use force.
Tip on Scatter Shot: SAVE your ammo. at the start, shot one at a time and don't waste your ammo, you will need it for the end. One shot at a time.
There are some good videos on youtube, but some don't explain what to do. Especially Whack Off. So, I thought I would share this tip. I see a lot of people stuck on level 8 and 9, 10 on Whack Off. Good luck