I played in the browser and the performance seems good. The jump is very good, I can see that you even have coyote time, and you can control the jump height as well.
Personally, I find the position of the controls kinda of odd, but this is just a personal thing.
I don’t think it’s very cool to have to hold down a key to aim and then press another to shoot if I can’t aim in any other direction, but I don’t know your plans for that.
Which game engine are you using (if you’re using one)?