Begin in Phase 2
Press [Up], [Down], [Left], [Right] and [A] at the title screen to begin in Phase 2.
Hit and Run Trick
Just take a couple of steps back from the monster (2-3 steps) then charge to it, attacking it one time only then repeat the process. The monsters will never be able to attack you. With this trick you build your character faster by killing (any) monster without worrying about your HP.