I am not talking about a 1:1 platform comparison because you are right, in a lot of instances the US is playing catch-up to what we already have. I was focused on their stances on wealth inequality, class disparity, etc since I see/hear a lot of similar grievances up here.
It really depends on the messaging. The fact that they kind of copy the slogans of our southern leftists makes them seem out of touch.
Canada always wants to do little things like tax the wealthy a bit more, be nicer to the poor or undersupported, but the general "mood" of Canada is like "okay, but let's not get hasty!". We're not like the US in that we are not so into passionate and imflamed affect. We want to feel good, but not necessarily be angry.
I think the NDP will do better if they hammered in a "the Liberals think they are reasonable, but they are not and they are Quite Rude and Sloppy! We have good plans that are beneficial and healthy for our country. Let's Be Better."
As you can see, this is like.. not at all the tone of the US left and would be decried as liberal centrism or respectability politics, but I think it would play really well up here to push more progressive policies?
That's my thoughts though. Otherwise the NDP will have to go back to labour unions and working class stuff, which is very region-by-region and not conducive to big federal policies.