Sneak past guards to get the jewel. You can left click on guards to change them into an animal, causing other guards to run away from them. Right click to move.

I'd originally planned to have multiple animals to morph into, where the bear would scare guards away, a dog would lure them, and a snake would kill them if stepped on. Interesting puzzles could probably be made with those components, but I ran out of steam. There's only one level, but I'm satisfied with something playable to some degree for my first LD.