That's fair, I am mostly canonblind for Archer, just seen some clips and gifs around online - but Gabbie's description of Venture Bros plus Mad Men, with spies conveys a lot

Undertale's a relatively cartoonish world in some ways - most characters mean well - but it has enough awful stuff going on that we can toss the characters at games like this

I get the sense Archer's opinion will depend a lot on how the actual early interactions go, so that'll be fun to look forward to!