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it was designed that way to follow some cycle routes. so from km0 to km160, you are on an almost segregated cycle way, it's practical if pretty unremarkable, the oise being one of the most drab counties.
To return west on the V32 is a weird choice, probably personal reasons. At KM 175 i would jump/stay on the eurovelo EV3 , which does what i described above and arrive in paris from the north east
edit : if open i'd recommend visiting just off the canal upon arrival
https://www.stolengarage.cc/en/home/
absolutely, it's the way that offers most sights.
@Hippy both your routes have their merits.
on the second one i would re-route between 110 and 175 miles, no point going all the way east to Senlis and returning west to enter paris again. But entering paris along the north east canal is interesting, you can find it further east, maybe in Claye-Souilly