Good game only thing I didn't like was there wasn't enough upgrades. By the time I was at wave 13 I had all the upgrades and was wishing for more to spend my 19k on to make it a bit easier for me.
So when I was playing this game I started thinking about how you should try to make a game like this for a gaming platform so you would get payed more (we all know you deserve it) because I sure would buy a game like this by you and I'm sure it would sell great. This game just has that quality of game play, mechanics and story that would make a great selling game (think final fantasy selling good).