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Is it impossible, does it take a long time or is it just very hard? How do you beat the final boss?

I can only assume you use delta while the main enemy is re-charging or something and you strike it as many times as you can. But if that is the case then it's just extremely time consuming.

You would assume correctly. I did write a walkthrough for a reason, y'know.

It is a hard boss, but I've beat it with the second try and I generally use to block those blue shots with delta blocks and I take out every shadow creature immediately. Once there are shadow creatures and shots, it gets tricky. But the boss hasn't as much health as you think it could have - nine or twelve strikes or so, and it was done.