well! maybe you should start using cooler characters stupid head. poo poo nose
but yeah! The anime is canon to the games or at the very least can be treated as a secondary canon! in a versus perspective it helps show the capabilities of Parappa more
while I'm here let me expand on some more benefits parappa in this fight! essentially just accelerated development which would help him adapt to the abilities of cuphead! Parappa is already a very agile foe helped more with his flat physiology and body control but dodging obstacles is something he's already done very well before so learning to dodge some more complicated projectiles isn't something completely out of the question what's mentioned is far more complicated but Parappa can just learn how to dodge on the fly especially if the battle goes on for a decent bit!