I am completely ignorant on this subject.
I want to say, though, that I used to think Game Maker was a bad tool until I found
Glum Buster and, later, Spelunky. I can really imagine a Nifflas game being made with it.
However, it is not compatible with Linux, which is an issue for me. Blender would be great, from that point of view and the fact that it is free/open-source just makes it more attractive, as I think we should all embrace this philosophy.
I am very glad to see Nifflas go multi-platform.