Very nice game and super solid concept! Ironically enough, if this game’s concept was applied to regular metroidvanias, then you’d finally fix the end-game power creep they tend to have, haha. I had fun, and ended up doing 2 runs! Though I was a bit disappointed that the dialogue at the end didn’t change when I went through the whole game without killing anyone. The sprite work, especially with the boss, was very well done. And the music had a nice melancholic feel to it!
I’d recommend against using a cylinder collider for the player character in sidescrollers, or to increase their friction, as I often ended slipping off ledges, especially when landing. It ended up being pretty frustrating, especially on one of the jumps near the end. But outside of that, the game controlled well and doing a pacifist run felt very satisfying, with all the weaving between enemies!