The music and art direction was awesome. I loved the character and personality. Controls felt great and I appreciated that you had two different movement options for moving around the moon (I preferred relative).
It took several tries, but I finally found the portal. After a while, I thought the arrow was a red herring because it took so long to find the portal. Because of that, I started looking at other places in the map, but eventually I stuck with the arrow and made it.
If I could give some feedback, I would recommend getting rid of the map altogether and simply having an arrow at the edge of the screen for navigation. I found myself almost entirely looking at the map while playing, only glancing back at my character in order to position myself better to get a star.
Other than that, though, it was a really cool concept and I loved everything about the art.