I made it to the bottom!
The game was easy but it never particularly felt easy, which I think means you hit the right balance. I agree that the scrolling background managed to keep me engaged, as it kept a feeling of progress. The bottom section also felt super scary and challenging, which made it fun to dance back and forth!
Singing your praise aside, the game did feel a little too simplistic and I wish it had more. Once you reach the bottom, replayability is pretty much out. So some achievements to do during the fall (reach a certain speed, do a certain time, etc) would've helped, or even having multiple levels where you can fall into different planets as different astronauts.
That being said, it was a fun and well executed concept, and the little snarky dialogues were just as fun :) (I loved the fall from space intro, that felt super clever)