This is a really great entry, both mechanically and aesthetically. It only took a few extinction level events and wiping out approximately 60% of humanity, but I was finally able to save one of the planets! The controls definitely take some getting used to (I wouldn't mind a float down button in addition to floating up), but that's a minor nitpick relative to everything this has going for it. Great job!
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Maybe make them just a hair less floaty? Don't make them too snappy because I feel like it definitely works in the context of floating through space, but there were a few times when I was "stuck" on a planet, and it was a little difficult to build enough momentum to get up and around it. That being said, I'm also kind of an impatient person, so maybe take what I'm saying with a grain of salt.
Actually I didn't think to put them in the chamber! But they were super useful to bring back down to the remaining planets and show them what fate would befall them if they didn't cooperate