The above draft research question "What role does the theme of deception play in the works of Shakespeare?" is still a very broad topic - way too broad to be a workable research question.
To narrow down your scope, one good technique to try is to apply limiting factors (relevant sub-areas of investigation). Ask yourself limiting questions about components of your topic.
There’s also nothing wrong with including a comparison in your essay, as long as you can provide meaningful analysis within the word limit.
What role does the theme of deception play in the works of Shakespeare?
So your refined research question could be:
How does Shakespeare use the theme of deception in Hamlet and A Midsummer Night’s Dream to illustrate the nature of love?
As you continue to refine your research question, remember to ask yourself:
Remember: asking the question in a different way might help you to see your topic in a new light.