Thanks for your feedback and for playing! I was hoping the tutorial at the start would have cleared things up, but I could've made it better it seems. The skeletons are able to attack villagers. If you run out of skeletons and health, you'll need to reset the level. It seems that is the thing that is confusing is that skeletons can attack. Later on you will need to dodge stuff with you and your skeletons which is why you need to select and move with the mouse controls. I think a better tutorial would have cleared all this up.
Thank you so much for playing and for your detailed feedback!