This was quite nice. I think your environments look really good. Shiori's narration of it all is a cool touch, but I found it a touch distracting at times. There are also places where it's hard to read, especially in the final boss area where you need to deal with the boss while trying to read what she's saying.
The platforming itself is really nice. It's fun to jump around and fight with all the little inky creatures.
This may just be me, but I think the sound you picked for swinging the sword is a little out of place.
Overall, I quite liked it. Nicely done.
Edit: I forgot to mention that your options button didn't work for me.