Hi, as I said in Class the main correction would be here: I like it because I can have indirect experience about farming which I can not do now in a real life.

You can also contract can not to can't which sounds more natural.

Something else to think about, that will make your writing even better is to link your sentences to form paragraphs, so rather than having 4 separate sentences you will have 1 short paragraph. 

I like the online computer game [game name], in it I can have my own farm and house. It is a farming and trading game and

I like it because I can have indirect experience of farming which I can't do at the moment in real life. I play it occasionally and I am doing fine with it.

Looking at conjunctions might help with this. e.g. 

http://www.bbc.co.uk/worldservice/learningenglish/grammar/ask_about_english/conj_clauses.shtml

http://www.primaryresources.co.uk/english/conjunctions.htm

See you next class :)