Hehe, nice and adorable game. Just let them eat the moon. I mean... Cheese! :P
Well, constructive feedback i guess, uhm. I think the terrain was procedurally generated? Great job on that.
As other mentioned, if they would float in the vacuum chamber that would have been awesome.
Also a way to skip the intro would have been nice. So I could go back to another observation session on how the eat the moon more quickly :P