Yesterday [x-tended demo]

Hey, it's a funky talking book! :D

Nec: "May you should take" -> "You should take"

The character seem to blink while on the game over screen.

A checkpoint would make sense after unlocking each thing.

I like the style, and the UI in the corner when he speaks is cool!

It feels strange that swinging the sword pushes me backwards when fighting that first guy.

"healthbar" is usually written: "heath bar."

In the middle of the text, you're writing "I" as a lowercase "i," which is incorrect grammar. But it doesn't seem to be a stylistic thing, because you're also using the correct uppercase "I" elsewhere.

Health: white on bright green is quite hard to read. I'd recommend darkening the green to make it easier to read.