It's fine to not be good with English ... but if it shows enough to be commented on in just a paragraph of description, it is extremely likely that it will affect the perceived quality of the game and storyline.
To be honest with you (because only honest feedback is useful feedback) the description totally put me off the game.
Think about how likely it is for most English-speaking people to somehow end up in a Shaolin monastery and you come across the first issue. This has already stretched credulity and the suspension of disbelief that storytelling needs.
Now, if you'd perhaps suggested right there that he's returned from a martial arts academy owned by some distant relative, or some business partner of his family, then just maybe it would be a bit less of a stretch. If that's too hard to explain in an introductory paragraph then just leave it out completely and simply say that the protagonist has come home from overseas and leave the game to explain it better.
Remember, when in a narrative you say "Your homeland" to a reader, they will think of their actual homeland, whether that's Uptown New York City, or some quiet village in England, or some Farmhouse in the South of France, etc. It's often better to actually pick a location for the game, as you then have people on the same page, rather than picturing all different types of places.
Anyway, next we learn that some friend of your mother has had her husband and child killed by the people who also killed your own parents. And then immediately after we're told that actually maybe they aren't dead at all (in other words, they definitely aren't)...
It just feels from that that this game is going to have a disjointed storyline that makes no sense and everything is going to be explained (or not) as just "because reasons" without any sense.
Why would a Shaolin Monastery accept the child you were when presumably you couldn't even speak the language, let alone have the understanding of their culture and society to fit in and not upset and interfere with the studies and learning of all other students, most of whom have families pay for them to go there as it is considered an honor?
When writing stories, always, always, stick to what you know. If something outside your knowledge is absolutely needed, research it, thoroughly. It will always make a better story.