gameplay is very very tight, the window to doage is very small. just have to learn the timing.
you cant increase your health but you can by health potions. you can heal between every fight. sell items you get from beating foes, then you can buy potions, so after youve beaten a few or so, the games gets alot easier.
and, well, therse not much to the game after you become leader. its kinda just over at that point. some side stuff to do i think but not much. game is a bit overpriced for what it is. even at the 4 dollar sale