long time since i play this but i will try instructions for anyone come here:
-level up not really a problem since you can cheese the battle with the main guy exploit weakness
- merchant will come in the mid game though he not that important
-ending is more like a variable way of content plus after beat the final boss except harem ending
-the romance mechanic i don't remember much but the jig is that you gift girls their favorite thing(that increase permanent love point), though the final scene will need extra push(by saving them from being r@pe from the monster, that increase temporary love point - which is a lot that that if you haven't gift most of their favorite thing, you can save them multiple instead)
there maybe more but i play a year ago so here is developer guide
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