Fits the theme very well. I would perhaps add some kind of indicator to help the player know what keys they are going to be using or an anticipatory signal that the keys will change.
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Did you play the game with sound? The narrator tells you the right keys most times. I think making the key changes predictable would make the game much less fun and less theme-fitting. But thanks for the feedback nevertheless! In the end it doesn't matter what the developer thinks about his game, but what the players think :)