It ends quite abruptly, doesn't it?
Right off the bat, it's pretty annoying that each death sends you all the way back to the menu. I don't care much about Health, because 100% of the time I lost, it was because I missed a jump and fell into a chasm or lava (blood?) pool. It would be far better if the game made you repeat only the current level, or (at least) if the lethal drops only subtracted 1 from your Health.
But I kept on trying because I wanted to see where you're going with it, especially after seeing "I should probably stop shooting people".
Did it evolve into a commentary about morality, or pointed out the differences between going the easy way (shooting) or the hard way (avoiding conflict)? Nah. Not only it didn't do that, in the end, the game just *stops*. Without even "You Win" or something, you're thrown back to the main menu again. That always feels a bit like a big middle finger whenever a game does that. Imagine winning a race and being awarded a free ticket to restart the race. It doesn't exactly reflect the effort it took.
I also quickly ran through the game to see if anything changes if you don't shoot anybody at all (because your health is large enough to allow just running through everyone) and no, it doesn't, the character still talks about not shooting people anymore.
I know I might want too much from an otherwise simple game, but these kinds of details or hidden meanings are what instantly kicks a game from "okay" to "wow!".
Okay, it is then. I love the rising particle effect from the lava pools, the rest is a fine game with reasonable character controller; with fluent movement, jumping and shooting. I like that the enemy characters look just like you, only with frowns. The rest of the environment is kinda bland and lacks variety, but I like the clouds in the background.
Definitely not bad, even somewhat fun, but the instant game-overs from *falling* in a *platformer* game make it more frustrating than it needs to be.