I really like the idea, but there were many things were bothered me, especially because I see potential in the game.
1. Feedback isn't good, sometimes all my sword dies at once by other sword, I have no idea why, a lot of time random text appears "swiftly, clumsy , idk anymore..." but I have no idea what they do , and how I can build my sword around those mechanics (expect maybe use good keywords don't use bad,diminish the strategy aspect). Many times animations don't correlate very well, swords disappear before animation finishes, it feels confusing.
2. The actions you need to do to get from quests to battle are uneccessary, why you can't simply go to direct battle, but you have to select quest (within papers without images, which is different problem...) and then press battle. It would be much better if you could directly go to the quest.
3. Game is lacking strategy element. In your GDD you mention auto battle pets as inspiration, and you marked game as "Combo" game, but I can hardly see any combinations, I just get random swords, and hope it works. Even if there were special effect I cannot see how they work, so I can't plan what to do. Also for quests, I cannot even see the power of enemies, and I feel like it's up to luck would you be one-shot by random OP sword with unknown ability, or attack worst 3/3 sword and get only 200 coins and piece of wood.
I read other comments, and the are less or more saying the same things as me. My suggestions are to look game with similar mechanics, and see what they do. I suggest idle games from kongregate. Also I suggest you checking Swords & Souls: Neverseen that is a very good game , which make players hype to battle after hard training. For idle games it's about grinding for something which you know it's OP but you can't reach it easily. You must make player have clear goal in mind which needs to be reached, so player will be happy after reaching, rather than just having random battles.