Didn't manage to beat the game yet, need to go to sleep, but its honestly a hidden gem, the initial story and the silliness of fighting using a spinning planet Earth is a pretty funny concept, making good use of the spinning theme.

The models, the boss design its pretty smart and when I first noticed their body parts could break, I was shocked and surprised I really liked it.

I do think the game could be tweaked in a few aspects maybe its just me at the moment, but not recovering health when going to other bosses or not having another possible way of recovering health makes it a bit too difficult to go further if you aren't super careful (unless there is a way and I haven't found it, will keep playing later) But also this could just be the way you wanted it to be, which is fair as it makes us learn the patterns and trying our best to defeat each boss without flaw and taking too much time. (I might not be so good and having to reset back to the first boss each time is... punishing)

I can tell you poured a lot into this game with the initial comic and effort into each boss. Ps. The idea of a superior alien coming here and being like ayo this place is good, let me make my home on the moon. Just makes me smile.