It was great if you didn't have experience it doesn't come across that way and within the time frame, it's really impressive work!
Regarding the space bar that'll just be something minor like the difference between "on press" or "on release" or a timing thing or something similar, not a big deal at all just something to note; it's not a tutorial issue, per se, just like a tiny tiny bug as if you try repeatedly tapping the space bar, instead of holding it, there's like a delay/cooldown on when you fire.
Hope that makes sense!