Really good! My brother was watching me play this, and he couldn't believe this was done in 3 days. That's a testament to how good the overall vibe is.
The graphics and game feel are especially well done. The audio was good as well, however, I felt it got too repetitive eventually. It was also too loud, so it was a bit jarring for me.
I did encounter some bugs when trying to climb ladders, where it would just bonk me back. I also think that the process of acquiring passengers was a little too repetitive and cumbersome considering the short limit on how many you can "hold" at once. Since there was no time limit that I'm aware of, it just felt a little too slow to me.
Ignoring that, this was very well done. The game feel, especially the controlling of the ship was very juicy. The art of the planet itself, and the merging of 2D and 3D for that (it sure felt like it), was done well.
All in all, I really enjoyed this one, although the some things such as slow speed and tedious tasks kept me from giving this a higher score than I did. Well done!