https://store.steampowered.com/app/1989150/Thread/

Neat metroidvania with heavy emphasis on platforming. No combat, ~6 hours long.

Also it's just over the cutoff but https://store.steampowered.com/app/2721530/Afterplace/ is a phenomenal 2D zelda clone with a really well-constructed non-euclidian map and fun characters. Really rewards clever exploration and testing the systems, though that also means there's a few interactions and conversations that are missable if you don't go out of your way to try and test everything.