The music is very fitting, it reminds you of thriller. One thing that’s bugging me is that before purchasing the range upgrade, the tower in the red circle below can’t reach the tile diagonal to it. 
Nice entry!
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Its so interesting that you say that, because the brief to the composer was "Make it like Michael Jackson's Thriller, more fun than scary, but 8 bit and retro! " I think he absolutely nailed it. And yes, you picked up on a key limitation of placing a tower on an outside diagonal. There are a few spots that are not very effective for the money! Looks like you managed just fine though :D Thanks for playing and hope you had some fun!