Vegan Boner!!
Fellow pacifists and cowards take note: it's possible to reach the boss WITHOUT KILLING A SINGLE MONSTER!
A few of the levels took me a couple tries, but in general all I had to do was keep running and jumping over the monsters until I reached the ladder. Of course, by the time I got there, I often only had a few hearts remaining, due to the unavoidable run-ins.
The stunguns made it a little more difficult towards the end, but for the most part it was very playable for those of us who like to run away from monsters rather than fight them.
Predictably, the boss could not be beaten non-violently. I didn't even know the keys for attacking/throwing/whatever, since I had only been using the arrow keys to reach the end. I looked them up and made a feeble attempt at fighting the boss, but ultimately decided to quit and be content with the progress I made.
I'm not sure it's a good thing to make your game beatable by the likes of me, though. I'm usually completely mowed down within the first level when I attempt the avoidance technique on this type of fighting-platformer game. I think that's the norm. Still, I applaud your very productive 3 days!!