itch.io

I didn't take it badly. Your frustration was very valid, and has been shared by many.  I feel it's a failure on my part as the dev that you weren't able to get both endings. I didn't convey at all that head shots do double damage, and conveying info like that will certainly be something I'm more midful of in future projects. 

The game has your progress saved, so if you're itching to see the A ending for personal curiosity,  armed with the knowledge to aim for the head, you should be able to beat them!