Gotta kill 'em all
I liked the logic of the game's progression. First you find you need a coin to buy stuff, then you find an old man who gives you a coin in exchange for a good deed, and you can use the coin to buy a sword instead, with which you can kill the baker and get the old man's bread anyway.
I liked that you could kill anyone, which is something I rarely see in a videogame. Usually NPCs are safe from a player's murderous intentions, but here it encouraged to unlock the different endings.
I liked the relentlessly cheery music and graphics that either contrasted my actions as a grim murderer, or satorised my character's unthinking eagerness to carry out orders.