I like the concept here! Plot's pretty nice, and I liked how the last option for "all spare" ending has the spare button be completely random if it triggers, and the transtition between meeting a character, choosing, and sparing/killing is great.
The rest of it needs some work, however. The space between all the characters needs to be shortened, and there's really no need for a jump button. The player character's also a bit too blurry, and the music tends to play much louder than the mad scientist's voice. I'd also love some subtitles, since it' s hard to understand them. These really combine to make it too tedious to go back and play the other endings.
Other than that, the game's still pretty good. Just needs some polish.