This is such a charming little game! The illustrations are wonderful! I think the rotating platforms are a nice added element.
There aren't many things I have an issue with, game concept wise (I think it's really fun!), although a few tweaks could improve the gameplay.
I did find myself getting stuck between the rotating and static platforms and had to wiggle my way out, so possibly widening the space between platforms so the gap is larger than the astronaut's hitbox could help with that. Also, the word for "score" in the UI is misaligned, but that's just a nitpick.
Overall, great job on this!!