I sense ragebait from the guy that posted that. Undertale is definitely not a "baby game". Like it has the topic of genocide, Photoshop flowey looks like a biblically accurate angel, and I don't even need to say muffets fight. We also have *clears throat*
Gaster (he looks like a horror game monster)
The d word that I'm not risking saying in an sfw post
Asriel (the god of hyperdeath)
Probably a fey more things that I missed
Like I swear to the Wendy's drive through menu that person is a toddler