The aliens aren't just aliens, that's pretty obvious from the tone, though the author's specific intent is hard to parse since there's a lot of overlap. I doubt the aliens are meant to be the rich since they're killing random aliens on the street. They aren't just a stand-in for bad or rude people either since they just established that humans can still suck in this narrative.
This leaves them as obvious foreigners, but I don't think the anti-colonial/imperialist aspect really works yet since the two MCs are losers and, despite what they've said, we haven't really seen the aliens in a clear position of power outside of PR compared to the average human. The MCs also spout pretty standard anti-[insert any maligned ethnic group here] rhetoric, so the aliens could be a stand-in for basically any immigrant group that conspiracy theorists claim run everything behind the scenes. I've seen rightwing Japanese artists panicking that Turks or Kurds secretly run the Japanese government, so I'm not sure the anti-colonial aspect of this is in good faith.
I think the absurd and comedic tone was a decent choice, and the cannibalistic premise is fun, but I don't think it goes far enough if it wanted to land the tone. I'll watch this trainwreck to the end, though. I'm fascinated.
