Strategy for winning: Build ACID towers. Space them out and upgrade dmg first and then upgrade time so that the acid wears off by the time the creeps get to the next tower. Before boss levels, make sure to save money so you can use bombs.
Developer, learn to take criticism. If you can't tell by all the comments, the controls suck. Other than that, the game is good! It could be a 5 star game with better controls.
You need to make the controls so that pressing left ALWAYS moves you left on the screen OR so that pressing left ALWAYS makes the tank turn left relative to its front.
I dont need to make it ALWAYS, because its my game and I made this control system, and please, before saying that anything of any game sucks, first make a decent game; you should know that its not an easy job, so next time try with more constructive criticism please.
2 issues
1: It seems like your script determines if a song is over by how 'quiet' it gets. I tried to play a song that pauses for a few seconds before going on and your game ended my song. =(
2: I got the "complete a difficulty 10 level" achievement after I finished a difficulty 9 level