I looked up what it exactly meant, and when used as imitation it says: ''the term denotes a literary technique employing a generally light-hearted tongue-in-cheek imitation of another's style; although jocular, it is usually respectful.''
I'm not sure if you could use the word ''pastiche'' in the context you did, but then again, I'm not a native English speaker so I don't know a lot of things. But maybe you meant to say ''parody''?