Really interesting concept! Once you get the gist of it, flying through asteroids feel quite empowering.
The game can also be a bit infuriating though. My biggest grief might be the inventory management part: too many times, after resetting my ship, I realized that I forgot to take some fruits and thus I did some stunts for nothing. Managing to reach a planet is hard enough, having to take notice of items and dealing with a time pressure on top of that didn't feel that pleasant to me.
But trying to fly around and land on a planet was fun! True, I didn't have a precise control on where I was going. Often the orbit was too tight to really aim precisely (the timing can be quite short, even in slow motion), so I was satisfied when a succession of happy accidents lead me to a planet.^^ The UX is really well thought on that regards. Not only seeing the future trajectory of the ship is helpful, but also the hypothetical ones gives a lot of controls to the player. The game successfully makes you feel like an aerospace engineer trying to compute optimal orbits, and this is a neat achievement. Well done!