On the second level (level 1.2), simply kill every enemy. I'm not sure if the spikey mines count, but I destroyed all of them as well, just to be safe. A few tips are to use the charge attack whenever the gliders appear on screen, and to just mash the X button when normal enemies are on screen, but make sure you don't run out of energy. Take a few seconds to let it recover, then charge/mash again. Can be done in Arcade or Free Play.