Thank's for your comment! Yes, there are multiple endings depending on which choices you've chosen. There are also quests that do not directly involve NPC (cobwebs, lost cow, bone) so you probably have missed a couple of these.
Actually, the cobwebs, lost cow, and bone were the very first ones I figured out! I wanted to see how far the map extended and found these quests naturally! I loved the cow quest, because I first noticed I could push animals, and then I saw a saw cow all on its own, so I naturally tried to push it back up to its cow friends! That was just a brilliant quest idea!