I don't expect the other 50% to take much time, at most it will finished in 2 days.
There will be also 3 difficulty levels in the demo, I want to please all the gamers categories, from good players with fast reflexes, to not so good players. I want everyone to enjoy the game.
Too hard and it will be frustrating for beginner players, but enjoyable for players with ninja reflexes, and too easy and it will be annoying for good players, but welcome for beginners.
So make sure to choose the difficulty that suits you. It won't be easy even is easy mode, so there is a challenge anyway.
Also if you you don't use ranged weapons and use melee moves only you'll get more points, and gain more lifes ( a la Shinobi).
If the game is to be made, then this important as you'll start the game with a fixed number of lives and there will be no continue, but you'll get plenty of lives on start, to maximise your chances to reach further levels and compensate for the lack of continues
I leave you with a picture of a hostage who will be behind a cage and has to be delivered, and for all who check this game progress, thank you.