Took me a while but I figured it out mostly. My biggest problem is that the swing range is so low that it's hard to tell that it was my fault that I got too close to the green blobs and lost all of my kill counter. I don't use the parry because sometimes it just resets my timer and gets rid of the bomb; I don't know if that's because I got hit or it's a parry mechanic.
Overall I like how creative the boss fight is. The large slightly transparent numbers with the cool font in the background actually work, and the zooming to visually show the bomb power is something I've never seen before; did you see that from another game or just realize it works well in this one? Oh and the menu management is nice and a lot more polished than most other games I've played today. ENWOD sound is my favorite.
Also sorry If I was too critical