Hey, great game! I only have a couple critiques, and they are fairly minor (aside from volume, but that has already been mentioned). First, I would love to be able to hold down to fire, as you already have a fire rate limiter in place. Second, bullets seemed to collide with the health powerups, which I guess was just kinda funny and not really detrimental. Lastly (since you seem to be a fellow cinemachine fan), you can use a cinemachine confiner to make sure your camera isn't showing a bunch of void outside your level.
Overall, a really fun little experience - nice work!