Arrow keys to move around.
 A to harvest wood/oil from trees.
 S to punch wolves in the face.

Link to source: http://dl.dropbox.com/u/12350369/ld/Lighthouse%20Keeper%20src.rar

Link to game: http://dl.dropbox.com/u/12350369/ld/Lighthouse%20Keeper.rar

You must survive the wolves and collect enough fuel (> 150) so the lighthouse can work at night.