It's a good thing that what is 'fun' is purely objective! Otherwise you wouldn't be able to make such claims and still be taken seriously.

Yeah but it's so much easier than making flappy birds clones!

You haven't seen flappy 2048 yet, huh?

Fucking hell, why did you give them the idea‽

Because it already exists! :) http://hczhcz.github.io/Flappy-2048/

Also the end product is much more interesting.