Nice one! Simple and satisfying. The visible trail behind the moving gun is a great touch.
I was annoyed sometimes by having to wait on the ground to reload, and by sometimes landing in the wrong place (and having to fire to adjust my position, then wait for the reload). Might be better to reload instantly when you hit the ground, or allow A+D to move horizontally when grounded?
I notice you’re using Godot. Building for Web should have been an option. You really ought to do that! Downloading binaries in 2025 asks rather a lot of users.
But all in all a real nice game. Five stars for Difficulty because it defeated me: I got as far as the first leafy platform in level 2.