You can move around with WASD/arrows keys (if you don't have a QWERTY keyboard, the keys to use are the one at the same position).

You can interact by clicking with your left mouse button. You can light jack'o lanterns, repair fences, drop your lantern and take it back.

Follow the sounds of the werepigs to fix the broken fences. Lights frighten them so try to keep the lanterns lit.

Some things might lurk behind you...