Hey there! "Let alone" is sort of an an idiomatic phrase and you use it for emphasis when comparing two things. Usually the second thing is bigger, or more important than the first. ...At least, that's how I use it! Merriam Webster defines it as "to say nothing of" or "not to mention." You're should be safe using it like this: "let alone" + infinitive or "let alone" + article + noun Ex. "Very few people ever meet a senator, let alone a president." "I don't have enough money to buy a new TV, let alone a flatscreen." And this one I just found on the web which made me laugh: "I can't remember what I had for breakfast yesterday, let alone the plot details of Pride and Prejudice, which I read back when I was in high school."

You did use it well in your sentence. here is a few more sentences that it could be used for. I have school work and chores to do let alone all the games you want me to play. Why dont you let alone things that aren't broken? Do you need more in depth about this? Message me if you do and i will go into a longer discussion about how to use let alone.