Interesting idea, though I feel this game leans to much on luck. If your first tower refuses to go any sensible location its game over in the first round. Maybe if you start out with at least two towers there's still a bit of strategy in there. Might also be useful if the path the enemies take is clear.
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Thanks for the feedback! You can freely move the towers (though this is random too) and the enemies in the first round move slowly enough that you should always be able to get a tower into a good enough position to not lose right off the bat. I absolutely agree that there should be an indication of their path, but that’s something I didn’t end up having time to implement.