Overall game looks good in the design I think. It's very difficult to figure out some of the mechanics, what they do and how they work. For example, the face with the first boss could be made easier to understand by simply making feedback in the form of a small animation in the color of the sprite during the hit
I liked the mechanics of the samurai. Samurai fight is not designed IMHO but concept is new and therefore interesting.
If I were you, I would do less mechanics, but more polished ones. ( Our game may also suffer from too many mechanics without being polished. 😅 ).
Overall game is cool!