A small, cute series. The artwork is nice, in particular the shots of stars in the night sky were a blessing. MC was wierd in the first chapter, using autonomy to describe his love for his crush. I'm glad this was dropped in later chapters, I find this a cheap way to introduce "science" into a story that only alienates me from the story. In terms of sci-fi, this was one of the better pieces I've read. MC was likeable and grew and seeing the alien girl grow was adorable.
The work likely suffered from the axe, as the love ending was open. The other girl who loved him also didn't get proper closure, so in general the ending was a letdown.
This seems to be the mangaka's first work, and it done very well. I have a weak point for alien invader romance stories like this and this manga tugged well at those strings. In particular since its just 12 chapters, you can't go wrong reading this.
8/10.