So here's the first boss battle against Magnet Bomber.
Strategy: Pretty simple, set bombs accordingly, dodging it's only attack (flamethrower) at the same time, when the bombs hit the head of the dragon, it is separated from the other segments of the body and you can attack it for big damage during this time. Rinse and repeat until you KO.
The music is awesome, you have to admit. Looking forward to using P Fangs :P.