As a spore fan, thanks for this !
Here's my first thoughts / feedback after playing a little bit :
In the editor when moving a creature's legs the body start moving to in a weird way which to me makes it a little hard to place the legs correctly
Also it would be nice if we could just close the load / save a creature panel by pressing escape instead of having to click on the button again.
Same thing for that little help menu on the editor, maybe I'm dumb but for my first two games I just didn't understand that the little "i" button was tied to that information. Since it's next to the name I was assuming it had something to do with that, maybe moving it somewhere else on the screen would make it clearer ?
One other thing is the little "i" button that you have to click to get info about what advantages each part give, I think that could be simplified by just showing the same text when the user hovers long enough on the icon. I feel like having to hover, then click on the "i" to open and then click again to hide the info is more than necessary.
Also I don't have the best computer but even with everything set to low I was always under 30 fps.
It was not really clear what I was supposed to do when starting to play and the creature moves in a weird way sometimes.
Lastly the whole "observe" thing is a little unclear to me. Is it just a way to focus the camera on something or does it have more interest than that ? If it's just a camera thing maybe renaming it "focus" / "look at" or something like that would avoid confusion.
Other than that I loved everything I saw ! Music is lovely too.
Thanks for this lovely project and good luck !