Actually pretty accurate usage of ü. I see so many people trying to make jokes about spelling in european languages and they always get ö and ü wrong. Tho its more "jü" if you want to write "you".
In German it's higher pitched and you need to put your lips into more of an o shape than for the -ou in the English 'you'. 'Jü' would be a sort of high pitched version of 'you' but definitely cute :3