Skill list should get a filter so it filters by each skills use such as combat is separated from general use skills like spear fishing. and have skills divided by each type of magic and type of weapon needed to use it
I think the devs should add maybe a prestige system as Dinosaur222 said where the bosses get harder every prestige or maybe add a new area after the 7 original bosses instead of just shadows, So you have more bosses to fight.
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Thank you for your advice:) I'll add that function in the future update or in the completed version!