Fun game. Definetely one that could become very good with some more work and small improvements here and there.
The first thing i'd like to mention is the music. It starts up honestly just bad. The sample starts up like a knife in my ear, but the wonderful thing is how it evolves into a wonderfull track with really good instrumentation. Also there were no sfx, but i won't critizice you much for that as i also forgot sfx in my game.
Sometimes you get chaught by the eroding planets and get stuck in an unescaplable situation, though thats probalby part of the design though it is a very unclimactic end. Also you sometimes get stuck in these tricky situations where you have to find a way out of the planet. These are both really frustrating and brilliant. As they are again frustrating, but at that point it becomes a kind of puzzle game with a time limit. Which is also very trilling.
Overall a suprisingly good game, with both flaws and potential.
Well done man