And that's why I'm taking up this challenge myself, even if the horror genre isn't usually my thing with the exception of RPGMaker horror games.
Hi, I'm new to this forum but I thought I'd chime in on this one.
I had a similar thought to yours a few months back. I have been working on a game that could be described as alien horror since. Except in my game
you are the alien, conducting an invasion in a world you don't understand.
Also, I agree, it is baffling that aliens seem to be underrepresented in rpg maker games, especially since that kind of scenario allows for a lot of creative freedom. I for one have been having a lot of fun playing with various tropes, such as organic machines, 'evil' AI, incomprehensible cosmic horror and such. Anyway I hope you succeed in your challenge, good luck!