I'm a big fan of this conceptually. 3D platformers are a criminally underexplored genre, and your character models and writing are adorable. That said, I think your games actual controls are pretty primitive. The game isn't a third person shooter, so there's not much reason for third person shooter controls. Picture this on a controller, where most people would feel comfortable playing a 3D platformer. Ideally, you'd just want to fire in front of you to hit anything immediate, for example the breakable wall at the beginning, and you only need to fire precisely very seldom, like during the ladder puzzle. It also took a little while for me to put together that the most effective way to get air is to simply aim the gun straight downwards without actually looking straight downwards, which I was doing most of the time until I figured that out. I feel like on a controller I'd just want to say, hold Left Trigger to aim straight down and hit the fire button to do this in a more ergonomic way, without having to drag my mouse / hold the right stick down.
If my wall of text makes me feel like I'm nitpicking or being negative, I'd like to be clear; I love this. I love your character, I love your cave ghetto. I want to see where you take this! It was a pleasure to play.