It took some time to get accustomed to the controls but after that it went pretty smoothly. I liked the gameplay, which I could easily see expanded a bit. Nice presentation, and that's with me using the inferior version of the game.
The tutorial was a bit unclear however, as I didn't know sending away the block progressed the tutorial. I would've liked to see the objective change to "send away block" or to have some clearer sound clue for it. Also [SPACE] obscured the block itself at times.