So after all these sad news from Canada, I finally finished her on regent/normal and played until 1951, connected Montreal to Vancouver, brokered 13 peace deals (2 with Independents), got my 2/3 UHV golden age and failed land goal with 99.46% of Canada being covered.
The only tile I did not own was St. John's. And possibly a tile 1E Boston, which says "Atlantic Coast". Does it count as Canadian tile? If it does -- it is wrong, 1E Boston and even 1 NE represent American states north of Massachusetts, not Canada. St. John's was French, and I was pulling different tricks: bribing French, spreading my culture by spies, using GA to surround city with my culture completely, hoping French will just give me that city as a sign of respect. British did exactly that with Boston, they just gifted it to me (which they got from USA via Congress and the USA got back from me via second Congress). If St. John's were to be in British hands I could get it by tricks, but it was French and they collapsed and St. John's became Indy. Which is worse than French, one cannot reason with Indys. Perhaps there should be an option to buy a city with certain conditions met: think Luisiana, Alaska, Gadsden Purchase...
In the entire game I had only 2 emigration events

, Canadian UP works fine though. It would be nice to see in the city screen which culture came to Canada.
There are historical tiles on the very north which are not maked "Canada", perhaps owning them could count as an "extra credit" and offset St. John's malus?
I only saw 2 Congresses in the entire game. First one -- right after my spawn, so I was not even invited. Thanks to my Rexing like crazy, I was able to ask for St. John's on the second congress, however I was turned down, and I had no way of influencing voting pattern, nor did I had any tally at the end to find out , at least, who voted how. Would be nice to have that info and perhaps more Congresses.
Peacemaking is rather trivial with so many wars going around within civs who can be bribed by techs. Much harder challenge would be to build Canadian Tower wonder, because I almost did not need to tech in this game. If you ever introduce Permanent Alliances (I am not sure what was your opinion about them) -- creating a PA with Britain could be nice goal too.
In the entire game there was no need for current UU whatsoever.
Overall very short but cool game. It is a nice feeling to )almost) win a game without killing a single civilized unit (only 2 Barbarian Mounted Braves were destroyed).