here's an idea- when you get a special weapon, it gets an activator prompt. for example, when you unlock the blade one that teleports you around and does melee damage to everything, it would activate whenever there's like a record scratch. the bubble shield would activate during calm bits, and so on. they'd all be on at once, but would only activate when the song is right for them to come out.
sorry, but i don't see why people think this game is great. i can't even pass the first level because it sends too many enemies per wave, and the waves are too frequent. i read the comments and saw that your units climbed on the golems, which i thought was cool, but sadly i'll never get to see that. but the graphics are nice, so you get a 2/5.
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It is a poptart! Just print a image of the game, toast it, and take a bite! Just kidding, I don't want to be sued.