This game looks solid and once you get it it's quite fun - however, it shares a problem with many games I see here.
It's kind of hard to understand how to play the game - there's very little visual indication of what to do or how to do it. I just found it confusing at first. I would suggest adding more detailed instructions on how to play - also try and make it more intuitive what to do.
With those simple changes - this could be a good game and I like the black and white colour scheme as well as the music.
It's also always a bonus when it's a browser game (which I genuinely have no idea how to do!).