Oh no it's not a skill issue this game's just really difficult. The dying repeatedly is basically just how the game works. It's a yaoi game with kaizo mario difficulty because I was in a weird place when I made it. I recommend editing your save to skip levels you're stuck on. I don't really have any tips besides "shoot from as far back as possible, hold down the mouse button instead of clicking, and memorize the timing pattern your gun fires/reloads in".
I won't be adding a crosshair or ammo counter because I initially had both of those things and removed them on purpose.
Your save file can be found in the "Bossfight she loved you_Data/Data/Saves" folder. There's instructions telling you how to edit your save file. The value you're editing is called "level" not "currentScene" which is what the instructions says it's called, because evidently I changed a variable name at some point and forgot to update the instructions. But the rest of the instructions are correct.