Actually I saw the popular series named the Squid Game in Netflix.

querías decir "Actualmente estoy viendo la serie.."? En tal caso diría "Currently, I am watching the TV series".

It's a polemic series for its polemicscontroversial series for the types of games that people must to play.

-no hace falta que repitas 2 veces "polémico", ya que se entiende perfectamente a qué te refieres (la serie es polémica por el tipo de juegos). Quizá en español sea diferente, pero en inglés suena más natural así.

-se usa más la palabra "controversial"

It isn't my favourite genere but it's a good series althought I don't like the ending.

The Squid Game

ActualRecently I saw the popular series named thecalled Squid Game ion Netflix.

It's a polemiccontroversial series for its polemicscontroversial games that people must to play.

La palabra en inglés que significa "polémico" es "controversial." Hay una palaba inglés "polemic" pero es poco común y es un sustantivo que significa una atacada verbal o escrito a alguien o algo.

It isn't my favourite genere but it's a good series althought I don't like the end.

Actually I sawI have seen the popular series named thecalled Squid Game ion Netflix.

It's a polemic series for its polemics games that people must to play.

I wonder how many people will have to consult their dictionaries to find out what "polemic" means?! Is there a simpler way to write this sentence? In any event, it probably isn't a good idea to repeat "polemic" in the same sentence.

Itsn't my favourite genere but it's a good series althought I don't like the end.

Alternative suggestion: It isn't my favourite genre, and I don't like the end. However, overall, it's a good series.