(deltarune spoilers)
Toby Fox:
I will say that basically, what you’re seeing here is not the world of UNDERTALE.
UNDERTALE’s world and ending are the same as however you left them.
If everyone was happy in your ending, the people in the UNDERTALE world will still be happy.
So, please don’t worry about those characters, and that world. It will remain untouched.– source
deltarune is not a continuation of undertale
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