I hadn't heard of Powdertoy before, what a fascinating game 👀 love sandboxes like that.
Yay, I'm glad it's got you thinking about what might actually be going on to allow us to move through the world. That's spot-on for what my intention has been with this.
The downloadable version lets you save creatures locally instead of on the cloud, has likely better performance, access to moddable files like being able to program your own ion channels, and a few niche utilities like being able to record and save neuron activity to file.