First of all, for your first finished game, its generally pretty good, you make nice use of the rpgmaker resources, and the mechanics are pretty spot on (puzzles, interactions, event coding etc.). It can get a bit grindy and the crafting system rarely gives good weapons (the 3000 gold axe beats almost all crafted items). Took me around 6 hours to complete and I enjoyed the experience, hope you make more games!
Heres a bug report and change recommendation, hope it helps:
-> you can warp out of the dream with the "warp" item -> this tints screen blue forever.
-> recommend removal of poison from rats, or lower the % dmg poison does, you can soft lock your save-file and die from poison.
-> volcano enemy drops fire essence that is excellent sell fodder, possible speedrun farm, this can be used to get the best items very early.
-> a lot of the skill books and scrolls are useless since the MC cant use anything except for techniques, perhaps make a general skill type instead
-> in the "sky temple" talking to the character in front of the temple freezes the game if you talk from the (literal) right side.
-> dream essence isn't consumed on use. (intended?) which lets you get infinite max mana if you have the patience to spam click.
-> the final boss is weaker than the jellyfish (maybe add more mechanics)