Fun game good concept!
How fun is the main gameplay loop?
Fun! Watching all the villagers running is entertaining since there are so many of them haha
The open levels allow for many areas to place traps which is great
How could the level designs be improved?
I found stage 3 to be slightly easier than the other levels due to the long corridor at the bottom so the arrow trap would kill everyone there.
The bear traps are cool but they don't feel as impactful so the level design is more about placing the arrow trap, maybe make them come back off a cool down? or maybe have spikes instead but then it might too strong not sure but basically arrows > bear traps.
How much could it be improved with a bit more variety (more traps, levels, etc.)?
The concept is solid so more traps and levels sounds like a good idea!
A more obscure idea is when roles get reversed it would be cool if the traps were placed where you placed them to try to stop the villagers so that there is strategy for,
1. Stopping the village
2. Making it easy enough for you to escape