A good interpretation of the jam theme, but:
- In the "How to Play" section, part of the tutorial is not visible
- A noticeable issue with the music: it restarts every time a battle begins. Also, initially there is no music at all. You should add a light background track
- Another noticeable issue is the font. If the game is pixel-based, you can disable pixel interpolation, and then any font you like will fit in. Also, you could increase the font size by at least a couple of notches
- There is no visual feedback for actions. Sound is there, yes. But for better feedback, you could add a simple animation, or at least some camera shake. Also, speaking of animations — the demon sprite looks blurry, whereas the enemy sprites look good. This is likely because you scaled up the demon sprite inside the engine, making it visually larger but losing quality. I recommend changing the scene and camera resolution