Ich will!

Can you say "Ich spiel." or "Ich spiel'."? I have seen people sometimes write it like that.

Is the 'ich' actually necessary here?

Do you pronounce l in spielen / spiele ? Most of the times I hear l is pronounced in a lot of words (i.e. FORVO) but in Duolingo is not. So should I pronounce (L) in words?

Does this only mean "to play" in the "the children are playing" sense, or can mean "act" as well ("I am playing Romeo in the school play" type of thing?