This is really polished. The pixel art on the title screen looks great, and the win screen has a lot of charm. The UI feels thoughtful too. Nothing's in your face, and the traits tab being tucked away until you need it is very clean. The little delay before revealing if you chose correctly is a good move. That tiny bit of suspense makes getting it right way more satisfying. And the sound design helps a ton; clicks feel snappy and the music is really fun to jam along too while you're reading/thinking.
The gameplay itself was very engaging. I had to keep clicking on the special traits because I have a horrible memory lol. Slowly studying each planet and being reminded of how little I know about ecological and atmospheric traits. The difficulty ramped up nicely, and I even got it incorrect several times on level 5.
But yeah, very polished game and just really pleasant to play on a good chill day.