This is a harrrrdd game... I got to Suika but didn't make it through, haha.
The game felt quite fun to play! The player mechanics were pretty enjoyable, and I liked how extensively you could make use of the Shuriken Platform to get around.
The biggest complaint I have is that bullets are impossible to make out from the explosion effects, which makes defeating enemies difficult without also getting hit.
The lack of lives is also an issue. Adding life drops, checkpoints or even an option to set your starting lives may help things significantly?
Overall, though, this is a highly polished work. Good job!