Sorry, but I’m going to play devil’s advocate. I do agree with you that it’s a good idea and a lot of fun, even if it sounds like i’m nitpicking things. It does need a lot of work and I’m trying to understand what you want to do with it.
For your ult:
Is it that people just lose the ability to jump, or does it negate all vertical movement and accelerate you to the ground?
If the latter, that might be interesting if you could drop it over a pit or something and stop reinforcement maybe. It still seems like a very niche ult, albeit one that counters mobility like Winston, D.Va, and of course Genji/Tracer.
If the former, it becomes trickier as you’d basically be targeting the areas where people would launch from, which is much more difficult to use.
Your key ability:
What is your key ability? It seems like it’s the antigravity hole, which is essentially an area of low-G like on Horizon that goes straight up/down on the map. I agree its fun, but its also very gimmicky and unreliable. I just don’t understand the purpose of gameplay of the character if you are building your abilities around this idea of fighting (or rather, exploiting the enemy’s vulnerabilities) on the moon’s surface.
I might argue for a pad that you throw out, like a junkrat trap, that will stick itself to the ground or wall and shoot out a beam. Along that beam, enemies and allies are accelerated as if they are falling. So maybe you can throw it behind you and accelerate your team through a chokepoint. Maybe you throw it next to a cliff and cut off a path for the enemy to reach the control point. Maybe you throw it on the ground and create a spot your Widowmaker can use to get a high vantage point for a snipe. There’s a lot of tactical possibilities and it changes fundamental ways of how the map works in a very controlled way.
Otherwise, mechanically, how is this character different from Mei? I mean she is an existing hero who builds bridges and lets players get to areas they’re not supposed to (like into walls/ceilings and onto the high horse position on Anubis).
The other abilities are fun and all, but they’re not exactly disruptive or especially new. A 360 degree lucio bump and a Zarya beam are fun abilities, but hardly as groundbreaking as a Doomfist being able to disrupt a tank line or a Brigitte able to stun a flanker/dive tank.