Regarding the gmtk video, I saw it a few days ago, and it was one of the few videos where I tought he got it 100% wrong. I think mixing genres like that is great. I know not everyone likes games like that, but I dont think you should not make a game because not everyone will like it. Mixing genres is fun but narrows your audience to people who like both genres. Im ok with that.
Systemic game is a great idea and would work really well with this games mechanics, but im glad I didnt choose it given how much time I had in the jam.