So to anyone else who decides to run this game in full, I've discovered something rather interesting. Its possible to carry over keys from level to level. Now the thing is you have to be able to skip the door that requires it obviously but this could mean big sequence breaks. The thing is however it takes time to collect these keys in the first place so there is quite a bit of debate there as to if its really necessary. Now 3 levels i can think of where its possible maintain keys by the end of level is as follows: Forest-2 silver keys, Monastery Exterior-2 silver keys 3 gold keys, and Mountain- 2 Gold keys. It'll take alot of experimenting to know whats best for single segment full game runs but this is great information for segmented runs and individual levels.
You can see the individual levels here ;)
https://www.speedrun.com/Ninja_Shadow_of_Darkness/individual_levels
Im gonna try streaming tomorrow. Probably just single levels for now until i master all the levels. particularly caves that one is a doozy. Im also redoing forest with faster strats and monastery exterior. Catacombs is easier now thanks to being able to keep the keys from monastery interior. That level was wicked hard before. You can skip every door in that level
I just redid monastery exterior on stream and it was slower with new strats :(.