Really cool idea. What's here is cool, but there's a lot of potential for using the special abilities of each creature for traversal and puzzles, the way the Slime was needed to squeeze through gaps.
I was tricky though since it was so easy to get bum rushed and lose all your health. I managed to get one of the Gnomes over to the Troll village since I thought I could get into one of the houses.
The only part that was a little dodgy was the first Slime. Since it was easy to ditch the body in a safe area with no other enemies, he often wouldn't respawn when I died and had to start over, so I had to restart the whole game to get him back.