Very interesting game here, there's clearly been a lot of thought behind how the game plays. I think the rules would have been better explained in a more concise way, as having all your rules hidden behind lots of text in the "Hints" box I found a bit misleading. I also didn't know what the overall objective was other than "use villagers to collect shields to then place shields which is immune to fire", and I kept losing villagers to fire by holding down one button for 0.2 seconds too long.
Quite a unique idea here though, I had some fun playing it and can imagine it making a really great game if you continue to work on it. With games like these, it's better to assume everyone is idiots and doesn't want to read a lot of text haha. Good work!