After playtesting the game after the submissions phase ended, I realized it was incredibly hard with the pistol and shotgun, and that you basically had to use the rifle to beat it.
Also for the camera issue, funnily enough losing an eye as a sacrifice was thought about, but that's actually a bug. The camera wasn't being enabled in the later stages.
If you want, I recommend trying the updated version, it's now beatable with any weapon, while still being a challenge for all of them!