They’ve recently released a demo on Steam
Consumed by a mysterious curse, restore a once lush forest and its inhabitants to their natural state in this action adventure tale. Experience fast-paced combat, puzzles, and the beauty of nature captured in handcrafted pixel art.
🌐 Steam, Kickstarter
Because it’s not a side-scroller?
Among other things, yes.
Edit: I can’t believe this got downvoted. If your criteria for Metroidvania is non linear exploration with guided progression then fucking Dark Souls and Breath if the Wild are Metroidvanias. I will personally record myself laughing and send it to you if you try to say 'Dark Souls/Breath of the Wild are Metroidvanias.