An interesting take on the theme. I liked that you included some story, made the game more immersive this way.
My only two gripes:
1. If I hold down the button, the slime keeps jumping. It's better if it only jumped when I pushed the jump button.
2. Some "coyote time" would be appreciated (the ability to jump a fraction of a second after the character leaves the ground). Precise jumping could get annoying when I have to walk back across the level to make another attempt. I feel that this game is less about jumping and more about smartly navigating the level.
Thanks for making this game!