No response, I'll add some input.
Personally, I think it's a strong piece, however, immediately the reader is faced with:
‘Cosi’ by Lewis Nowra is a humorous but tragic play.
I understand what you are trying to do in setting a basic statement, however, something a little more 'attention-grabbing' would work better in this case.
The introduction overall is solid, but nothing more - I believe it needs more depth, more surrounding insight into Cosi.
There are some issues with language: eg
right through the play
--> throughout the play?
Nowra intended for ‘Cosi’
--> Nowra's intention in the creation of his play, 'Cosi'
Or even:
Whilst Nowra's intention in the creation of his play, 'Cosi', was to provide a humorous spectacle, the comedic backdrop is outweighed as he reveals the terrible truth surrounding mental institutions in Australia during the 1970’s.
The conclusion to the second paragraph is excellent, well written; perhaps a little more depth again in thoroughly explaining the quotes used; don't be afraid to delve into more discussion so long as it remains relevant to the prompt.
The third paragraph goes into some good discussion following your topic sentence, if I had to pick on anything it would be a need for more reference to Nowra's intended meaning; whilst you mention that what occurs in the play is as a result of Nowra's "negative views on mental asylums" expand and reference within the paragraph. You have done this well in the forth paragraph, which by the way, is both complex in thought and well written
On a different note, a major theme that ‘Cosi’ shares with the audience is that of love.
Personal opinion, but not a fan - "on a different note", screams laziness (whilst that may not be intended) - that topic sentence is far too vague, it says virtually nothing.
Lucy and Nick and to Roy, ‘love is what you feel when you don’t have enough emotion to hate’.
Whilst this may appear the case, I would tread carefully in applying a quote by one character (Roy), in relation to both Nick and Lucy. Whilst Nick and Lucy are dismissive of notions such as love and fidelity, predominantly concerned with 'free love' and their occupations, in essence they do not 'feel' love, but rather intrigued by flings.
‘Cosi’ proves this true by creating characters that are into ‘free love and orgies’
Quite a broad, vague, statement - it leads the reader to believe all characters revolve around this concept, when in fact as you mention previously, they all share different notions of love; you are contradicting yourself with that statement.
Take note that I am especially picky on the discussion surrounding 'love and fidelity' as it is a key notion and important to nail the discussion and complexity of the ideas involved.
There are various spelling and grammatical issues I have not made note of which you will pick up re-reading this over again.
The conclusion whilst relating to the prompt needs a little more depth, make sure to re-emphasize all your important points and conclude with a strong statement.
Don't take any feedback to heart, it is provided to offer tips for improvement, take it as you wish.
Good luck!