Really enjoyed the video... but the Zarya clip at 2:18 looks like some type of aim/projectile hack.

sad airshot
https://streamable.com/glyg

I think it's too early to say he is broken. But I can say that both of your nerf ideas would make him completely unplayable, especially the first one. At 125 hp you get one shot by everything in the game. If he does prove to be OP, either part of your second nerf idea might work, depending if you want him to be more of a long or close range hero.

One thing I've learned from playing dota is that the smallest nerfs can make large changes, especially in a game with a large character pool. There are going to be other characters that can perform the same job, and even a moderate nerf can push characters into obscurity. This will become more relevant as more heroes are added to the game.