Great graphics, cool music, interesting gameplay! I really liked it. I like the idea of using a mechanic of some game in totally different context. Very creative, well done! :)
It's great that there is a tutorial. I would suggest trying a bit different approach for this part - making the tutorial embedded into gameplay. If you have separate tutorial, a player have to click a lot to go through it in one go. If you make it inside of the gameplay, you could put different elements of tutorial to appear after some time of practicing each of previously introduced rule. I liked this approach in Metal Gear Solid Peace Walker on PSP.