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I like the game but this game has too many "one-time" dungeon. If you missed something, you have no choice but to start a new game, it is not a big problem if there is guide but unfortunately this game is not that popular and it doesn't have any complete guide after all these years.
Game is easy enough that a walkthrough isn't all that necessary. Just exploit elemental weaknesses, but place more emphasis on piercing commands. As you get further into the game, keep an eye out on abilities with "burst" in them as those moves will have higher effectiveness based on style > 100%.

This person from Steam created this checklist guide too: