ok so what I saw in the beginning was an ok set up, but you shouldn't just give the viewers an "oh yeah did I mention this?" kinda thing. The whole planets and sun things should have been said through exposition. The animation was also really simple, and some voice actors would be nice.

The art may be rudimentary and the plot cliche, but I liked it. The dialogue felt natural. Coming to the ending, I feel anticipation for the next episode. (This episode was the first I've seen.)

Regarding the introduction to the setting, placing the text above the four planets was distracting, particularly since the planets were objects being described. I'd recommend placing the text above or below the solar system.