You really nailed the feeling of that era and I can tell a lot of work went into this. Adored the cutscenes but had a really hard time with the gameplay. Didn't get very far, but still found it cool to check out!
I've recently analyzed a deficiency in the combat mechanic, in that the player-character's full chain of attacks currently only seems to occur properly when the attack button ('Z') is held down, but it apparently did not respond effectively when the button was repeatedly pressed.
I've since ironed out this problem, and these changes will be reflected in the full version of the game. In the meantime, I'll try to update the demo version, as well.