Focus on the top of the screen to collect coins and energy bits dropped by some bombs easier. You will be able to see the patterns that the incoming bombs create, and be able to avoid them easier. After things get crowded you will be forced to also consider the bottom half of the screen. Remain towards the middle to avoid getting pushed to the sides and getting trapped. When you see a pattern in the bombs that allows you a way to squeeze between them, use it to stay in the middle.