I would be constructively critical, though remember I’m admiring your game and I’m amazed about the graphics style. For me it’s too hard, especially at the beginning, when you have one fragile life and the sword is spinning so fast 
and I don’t think of myself as a casual player Maybe think about balancing it? Because in mobile games, you have only few seconds to catch someone’s attention. In my case I was also more and more focused on the tapping and the circle instead of the beautiful monsters you created. Maybe before every combat introduce somehow if a new monster appears? I was also thinking about adding some quick intro, a trivial motive, even saving a queen from the dragon 
Unlockable items and charms are awesome and I’m also thinking about introducing them a little bit earlier If you are good at crating dialogs and snappy retorts, why not try one at the beginning of the fight? Even in medieval elevated style? If it comes to marketing, your game is great for visual representation, so take care of posting screens from it on other forums, try to reach some reviewers that could post graphics, or even let’s players on YouTube Spread news not only among players but also medieval and marginalia fans
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