Was Dk:Tropical Freeze's Difficulty the main reason it did not sell that well?

[curl-6]

jonathanalis said:
plataformers used to did good in snes era, is like a fps nowadays.
but now, no 2d plataformer thats dont have mario in its name sell well.
look at delicious rayman legends...

dkctf is way better than dkcr, in my opinion. goty so far.
it is sad to see that good and hard plataformers dont apleal like before. it is still my favorite gender.

Bold 1: DKCR sold over 6 million.

Bold 2: XD Epic typo.