I love the ambience you have created here, I like venus especially I think it is my favorite one out of the bunch! I like your progressions of harmonies in the tracks as well and I think you capture space really well here! I ended up listening to whole thing throughout 3 days so my feedback might be a bit spread out (also I hope itchio lets me leave this comment too cause I got mistakenly post flagged as a bot the other day, probably because I take too long to write comments or something haha)
For some constructive feedback, I will focus mostly on the Uranus track as an example; I really like the calm nature and the warm-timbred synth with the wind-like fx playing in the background offering a nice and simple atmosphere, I believe the textures could've evolved a bit more for the duration though. There's many different ways to approach that but I have a simple example that wouldn't require any extra instruments, one approach I can think of is an automation of sweeping an EQ on the noise/wind every now and then, almost like a non-traditional "Call and Response" between the sine wave and the noise/wind, but there are many other ways to develop the textures as well! That aside, I still think you did a great job highlighting how Uranus feels (as well as the other planets)! Ambient is a really difficult genre (I personally think it is one of the most difficult ones), so I wish you luck as you continue to explore that area! Nicely done here!