Writers often indulge a charming fantasy that publisher and agents are looking for originality. They are not. They are looking for works that fit into a well established sales channel and that habitual readers of a genre can quickly identify as the kind of book they like to read. Pretty much the worst thing you can do in a query letter is indulge in any kind or originality. This is about sales, and sales is all about established and reliable taste.
We might all wish be believe otherwise, but a moment's reflection will show it is so. Publishers and agents do this to make a living. They want things that they already know how to sell. Remember all the stories about how many publishers turned down Harry Potter? It was something they had not seen before (or not recently, at any rate) and did not easily fit any of the current sales channels. Publishers (and therefore agents) are not keen to take on that kind of risk. Brilliant and original often falls totally flat. Competent and familiar pays the rent.
What you need to establish in a query letter is that your book is something that the publisher or agent is going to be able to sell. "Cat and mouse game" is an idiom that seems to show up pretty frequently in the description of published thrillers. So that's a good sign that it works to sell books. Avid readers, the kind that keep publishers and agents in peanut butter and jelly sandwiches, are always looking for another fix of the same drug. They want the same, only different. But not so different that it is no longer the same. Sameness is not a vice, it is a virtue.
An agent or publisher looks at a query letter and asks themselves, is this a serious professional writer who can turn out decent books that meet the needs of a well established and profitable market? That's what your query letter needs to project. Originality has very little to do with it.