Problem is, you cannot use LocalStorage 'like' WebStorage, unfortunately.
You're using the right expression, LocalStorage.itemValue
but, to get that itemValue in that expression, you'll first need to use a separate action:
LocalStorage: Get item: "currentLevel"
Then use a separate event of LocalStorage: On Get Event ("currentLevel") and then use Compare two values as its sub-condition. Then LocalStorage.itemValue will contain the value of "currentLevel".
I know, I miss webStorage too.