In the same vein as Prisencolinensinainciusol, there's also "Skwerl", a short film in the same kind of pseudo-English. As a bonus the screenplay is linked in the description and it's fascinating.
A big thing that gives languages their distinctive sounds is called "phonotactics", which are the rules for what sounds can be used in words and also where they can be used, like how you can end an English word with /ŋ/ (ring, thinking...