The premise is good and the art's very solid (everything reads well and the styles is very consistent -- this art is super impressive for your first time doing SVG stuff!), but I also feel like the design was a bit lacking. I think this could work well as a puzzle game with levels designed around manipulating the hero into taking certain actions. E.g. if the ghost always makes him turn around, you can control his path a bit more, or if when he gets armor he becomes overconfident about his abilities you can bait him into a fight with a high level enemy. I'm a huge fan of deckbuilders and I don't remember seeing one that mixes deck building with tower-defense, so this could be a really novel idea!