Works well as a prototype for a bigger game, not as much as a game in itself. I'd say my biggest pet peeve is that the game guides the player too much, specially due to the blackboard showing the hints. As a person who likes to feel a bit challenged by puzzle games, personally I would hide the hints and make them appear only when the player is lost (by asking the game for a tip, or by being idle for too long). A bigger game would also allow to explore the game's concept (which in itself is awesome!) with more care and a better difficulty curve. That said, I enjoyed the experience, that it left me hoping for more is not a bad sign, and the ending was a good twist to the already learnt mechanics.