A very neat little game! A little more variety in enemies or towers would be nice in a future iteration, as I just ended up surrounding the space ship with miniguns and couldn't lose, but for 3 days this is perfectly acceptable. I appreciated the originality of a free-place tower defense. Great job!
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I'm glad you enjoyed it!
The biggest problem (and likely the reason you were able to surround the spawn) was definitely getting the AI to function properly. Most times they just get bugged and don't move like they're supposed to sadly. Currently working on a fix and will update the post-jam submission on my page once I get it working :)