I really enjoy your game and have a couple ideas:
1: If your ariral reputation is high enough they will rescue you if you fatally trip or crash once a week by taking you to their treehouse or your bedroom. When you wake up there's bandages around you. (and maybe extend it to the night they drag you into the forest while you sleep regardless of rep as they would feel responsible)
2: Some pranks the arirals could do is one where they sneak behind you and use a squeeze horn behind you or a air horn at low rep. they run away if you turn around before they do it and drop the squeeze horn. Another thing is they can learn pranks from you if you make one slip on a banana peel or throw something like a pie in their face and eventually enter a prank war.
3: With the climb mechanic you could have it slowly make kel stronger such as for every 10 times he climbs he gets 1 point in strength and strength would primarily just increase max health and ease of lifting/throwing objects. Also possibly have a joke scenario where the arirals are too afraid to mess with kel because of how buff he's become after 100 points of strength.