Mortal Kombat?
The game itself is OK. It has some design flaws like the "I pushed a box and now I'm stuck" stuff. The Sensei takes too long to talk. The game needs a key to make all the text appear WITHOUT making it skip to the next duologue box.
As for the actual plot...This game's knowledge about ninjas seems to stem solely from Mortal Kombat. It's extremely western and reminds me of anime fangirls screaming in horribly accented Japanese(such as saying Kawaii in normal speach).
There does not seems to be any research into the subject of Ninja, Ninpo or Ninjutsu in this game so I might as well provide the answers it needs.
Sword Mastery = Kenjutsu.
Chakra is just flat out incorrect. Mana = Chakra. The weapon is called a Chakram with an "M". It's an Indian weapon, not a Japanese one.
The "spear" is actually a Kunai connected to a rope. That is not typical Ninja gear. Ninja's typically used a similar weapon called a Kusarigama. Same thing except it's a sickle instead of a kunai.
The "traps" are called Makibishi.
Also, "This skill is only available IN version on ___ website." Needs better grammar. Proofreading can vastly improve the quality of anything.