Done. The storyline quests are too easy and rewarding, the side quests the opposite: at the first levels too hard and compared to the storyline quests not really rewarding. A bit more balancing would be nice! Despite all this critique: 5/5! ;)
I don't think its difficult at all. I played the last 70 levels in 1 rush. Main strategy: leave all the high damage dealing monsters alone if possible, it's not worth the few gold coins. And because there is no EXP at all there is no need to kill all the monsters of one level. Only fight those that you can kill before they hit you more than twice. Forget about money bags behind several high damage dealers, only go for STAT stones and artifact chests. Buy as much healing potions as possible there is seldom a need to buy armor or weapons. Forget about elementary secondary damage, ATK, DEF and AGIL are most important! Don't care to much about magic, the elementary strikes are weak. Better spare your mana for healing spells.