Yeah, I never actually beat NG1 myself (without using an infinite health Game Genie code). I'm glad you enjoyed my version so much, and thanks for making a video!
Viewing post in The Ninja Gaiden as Interpreted by MiniMacro Sound comments
Despite that, It's still difficult and the final boss can't be beaten easily, I found out destroying the tail will make jashin teleport, But if you don't it will stand there, It has advantage but seeing how much damage you have to endure against the tail that now spawn fire and invincibility frame mechanic make the strat much difficult to perform.
The original final stage is simple but in this version, You made it much longer by making the stage require like 3 rooms to enter the boss.
And each room has their own gimmicks. Like the wind mechanic from NG2 and some stuff.