It's a simple concept, but well made in the end. There are other games with similar ideas, usually it's hard to balance the difficulty in these - many tend to be very hard, because of course developers test their own games and see them as easy. This one starts actually surprisingly easy, but after a while the game gets harder, so it's nice to play in the sense that you get this increasing difficulty that you can improve your skills against. The graphics look okay, it has that mix of hi-res and pixel graphics.
I'd like to invite your game to take part in our Game Development World Championship!