Nice, this was a pretty enjoyable lil papers-please-like. I liked the little ways you made in which something could be wrong. Of course if this was a bigger game, you'd likely introduce the elements one by one. But I got around to it pretty quickly and it sorta helps that there is no time pressure.
I just wish that when I get something wrong, it'd tell me what I missed. And it would be cool to have two different bad endings, one for letting through an alien with a problem and one for stopping one that was fine.
Also, damn, nearly all of these aliens had some kind of mistake with them haha.