Fun game!
The music is well done, the narrative is interesting, and the use of the color limitations was great.
If I had any complaints it would be that planets felt 'sticky', the initial impressions of controls leaned me towards pure A+B holding, which resulted in play that felt like I was colliding with things coming fast enough I couldn't react to (Likely just because the acceleration playing like that is quite high compared to the screen space) though the tunnel section broke that tendency out of me. Enemies not resetting on respawn made respawning almost a strategic choice, but it usually felt like more of a benefit to respawn and have a cluster of them on top of me to generate more fuel.
Didn't notice any bugs though, so I'd say it felt 'cleanly done'. Good, fun, clean experience.