Read "The Planet with no Nightmare" by Jim Harmon online for free on Textopian. Full text with search, annotations, highlights, and AI-powered reading aids.
The creatures on the little planet were real bafflers. The first puzzler about them was that they died so easily. The second was that they didn't die at all.
Tension eased away as the spaceship settled down on its metallic haunches and they savored a safe planetfall.