The same person that leaked the existence of Metroid Dread claims that developer MercurySteam is working on a follow-up.
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Metroid Dread developer working on new 2D Metroid claims source
RUMOR: New 2D Metroid game in development for unspecified platform : r/ Metroid
Metroid Dread Review –
Metroid Dread: The Sequel Fusion Deserves?