This is neat, I can definitely see what you were going for. I think the spin resource would make much more sense if it was split into distinct levels, rather than having an open world. (Then you could have separate leaderboards for amount of spin used or time spent, as an example) As is, it just felt out of place and frustrating - not that it actually ended up impacting me much though, considering how often I fell into the void. XD The conversation popups don't really work well in a game that captures your mouse, usually they would pop up on the side so you could continue what you're doing - it just felt like my momentum kept getting stopped because of it. Then there were a few bugs, like the camera not always flipping over in the lift to the moon base and some weird gravity things when I got too close to an edge when falling.
But I enjoyed rolling around as a ball, the top was useful in parts, but I only swapped to it if I really needed the glide. I think with a much larger open area where I could really pick up speed, I could see myself really enjoying it. Nice job!
Metagame cog 101/126