Also before you play it lemme give you a warning
The first level is the hardest one in the game because not only do you start out with a shitty AC, but the boss at the end is a pain to hit with your only decent weapon. (Both are my opinions but the boss was pretty hard when I first played)
You can of course beat it if you're determined enough but this game doesn't sugarcoat it in the tutorial when it comes to difficulty. It's just like "ok, here's the game" And that's it.