WOW. I'm a big fan of the art style. Every single aspect of assets and animations are beautifully done!! I like that you included the theme in the enemies instead of translating it as upgrades on the main character. Pretty unique!
The green stamina mechanic is well thought, although it would be nice to mention that affects your life in a mini tutorial or in the description, because it's hard to realise it while fighting. Finding out by dying is cool tho! Also, in case you keep developing, some healing here and there on the late game could be a nice addition.
Overall, this game is really fun to play, pretty smart and well executed. It gets progressively hard but remains rewarding as it should be. Considering this is done by one person at that time limit this game is incredible.
Great job. 5/5 stars for me.