It's beautiful, but when I went to try it out myself it seems it's pay to play?

https://ko-fi.com/s/e1e0f91951

Note that's "Prototype 1", and I gather the more developed v2 (featured in the update video) isn't available yet.

I bought the game so I could study the code. Unfortunately it is wasm & obfuscated. I'm gonna see what my handy dandy big giant brain buddies can do with it.