Because someone has to make Metroid.
http://www.nintendoworldreport.com/news/52325/axiom-verge-2-announced
In an epic, one last thing, moment during today's Indie World Showcase, Thomas Happ revealed a sequel to his acclaimed Axiom Verge. While we don't know much, Axiom Verge 2 seems to carry forward the Super Metroid inspired gameplay of the original. Axiom Verge 2 will release on Nintendo Switch in fall of 2020.
