Sega explains why a Sonic Mania sequel didn't happen

Sega and Christian Whitehead both explain why a Sonic Mania 2 never came together after the success of the first game.

Sonic Mania – 16 Cool Nods to Sonic & SEGA

Sega Ages Sonic the Hedgehog 2 first details, screenshots - Gematsu

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The Dreamcast Junkyard: Some Thoughts On Sonic Mania

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Christian Whitehead Is On Good Terms With Sega, And They Never Planned To Make Sonic Mania 2 - Gameranx