shooting is a bit off, I would add a crosshair and make the projectile faster, and more precise. If you did this with unity, you can cast a Raycast from the crosshair, and save the point where it hits in a variable, then have the bullet spawn and you can use movetowards to make it shoot more precisely. The enemies can sometimes see you through walls, and you probably used the standard text for the tutorial, that's why it's so blurry. Use textmeshpro, It's just better. If this is your first FPS, it's not bad, you clearly have something going on :) Keep working on it and it'll be great.
If you want to check my demo out, it's on my profile, I'd really appreciate it :)