There's a lot of things that I could say here that others have said, like how fun this character is, or making comparisons. But honestly, the thing that sticks out the most to me about Surge is that she just feels satisfying to play as. It's not just the abilities or how she handles, but the culmination of mechanics, visuals, and audio that just...feels GOOD. I know that's saying a lot without saying anything, but hopefully the point comes across.
That being said, I do have one criticism that a lot of people have also mentioned. I like the ability to stay decharged to use a regular double jump or a homing attack, but...holding custom 1 down is just awkward feeling. I feel like giving an option to make it a toggle instead could probably go a long way in helping with that.