I beat your game. I noticed a few issues. I like the idea of a rather floaty platformer + run and gun combo, but there's nothing to shoot at to complement the style, so it's just precision platforming by itself.
I also noticed that it feels like you used a capsule or sphere collider for the player, as sometimes you can fall off the edge of platforms without using.
I recommend using a box collider to prevent issues like that in the future. There also is no terminal gravity, meaning you can't run off of platforms without your gravity being extremely high compared to the expected rate.
I enjoy the music, and the art style is pleasing, although the background and tiling could use some touchups. I think if you kept working on this it could turn into something really unique!