Alright, let's start.

Gap closers, jumping, basically anything related to distance.

How far can we jump in the game? How much gravity is there in the game world? Is it similar to our world where we can maybe jump two feet into the air at most? Is it okay to have an ability that causes someone to jump 12-20 meters backwards in the air?

In my opinion, no. That is not okay. If you jump 12-20 meters backwards, which is respectively 36 feet to 60 feet, you are going to have broken bones and your character will take fall damage, so I would like your input on that.

What, in your opinion, would make a logical gap closer or gap creator/run away ability?