Nice to see your comments and ratings!
About the visible controls, i just make the games with the less UI elements as possible. It could need more time to get familiar with it but the final connection between the player and the game is more pure this way, based on feelings and movements while the eyes just look the gameplay. Dunno if this is the best way, is just the way i design.
Tetriser, i'll note that option for the player to change game controls for my future games.