Hey!! The game is like a PvZ, it´s a very good start. Need some polishing in audio and improve a little the graphical part, but the game is pretty solid and the mechanics are smooth and consistent. I tried to play to maximize the savings. 3 ninja ice is the number. Less and you loose hehe.
About the music… I think you are using one with rights reserved. You need to find a similar music free or Creative Commons (be careful with that).
You are improving each game! Congratulations, you are doing a great job ^^