I've gone and done it! That was pretty fun! Two small points of feedback: I thought the game was glitched because I couldn't place anything where I tried, I had to look in the comments to see what to do. I think some more specific instructions in the instructions page would help out dummies like me haha. The second feedback is maybe preserving the player's unfinished structures for the next wave or having some indicator to let the player know unbuilt structures will be lost and not compensated.
Other than those two small things, the game is beautiful and incredibly polished. I thought for sure this was from an asset pack, kudos to the artists. No bugs, interesting mechanics, nailed the theme... overall an amazing submission!