I didn’t quite get how the game related to the topic until I accidently flew into outer space :D
The visual are very nice! Though the holes in the ground look little off because it’s just a black bar. Some dirt to the sides could fix this.
This is personal preference, but I don’t like that you need to hold the space bar to jump higher. IMO it’s a bit awkward.
I didn’t hear any sounds, but that’s probably because I’m using Debian and I have to run this game using Wine, which isn’t always seamless. A Linux (and OSX) export would be welcome. I took a look at the sound assets and they fit the game well so I gave the sound rating a high score regardless :)