I think you may slightly misunderstand the critiques you're getting. I read your comic and remember giving that critique.
It wasn't because the story in itself was bad (there wasn't much of it at the time) it's that your character names and designs and basically all nomenclature is exceedingly non-specific and lead me to believe that you were doing a comedy parody of fantasy tropes, not a serious one. The main issue I had wasn't the skeleton, it was the skin, or lack thereof.
Like your hero is actually called "Heiroe". Your Dark Lord is actually called "Dark Lord". Add to that your character designs being quite simple (not that there's anything wrong with simple in itself, just that serious-tone fantasy is more known for going overboard than being understated) I thought it was going to be something more melodrama/comedy like the opening of One Punch Man or the game Bad End Theatre where the characters are also named "the hero" "the maiden" "the underling" "the overlord" and the tone is generally light throughout until the true ending.
I don't know how much the core of my critique is getting across because it didn't the first time (I'm sorry I wasn't clear enough). I'm trying to say that when you look at the presentation, the story feels generic. Like you've taken fantasy tropes yes, but you haven't made them specific to you yet. There's A hero, there's A dark lord, there's A prophecy, there's A quest and A fight between good and evil, light and dark... But it doesn't feel like they're YOUR hero and YOUR Dark Lord, etc... like you've stripped down Harry Potter and Star Wars to their base concepts and realised "oh, they're really similar if you take away the specifics, I can write a story like that but subverting the tropes" but you haven't rebuilt a seperate identity on top of the skeleton you took, you felt like changing the skeleton was enough... But skeletons can be anybody's at the end of the day, there's very little personal identifiers on skeletons.