Controls took some getting used to and weren't immediately clear. user.json needs to be deleted from your Linux build or people won't be able to play it. (I made that mistake more than once with Pong and its high scores.) Actually, there should be a "restart game" button within the game itself that deletes progress so that you can replay the game. Music was fine. Levels were decent. A couple things like in the labyrinth there was a spike I kept running into because it was very close to the screen edge made the level more about memorization. But it was a fun game overall.