Pick your favorite genre:
What The Golf? - A wild and hilarious mini golf game
Miasmata - A horror/cartography game... you heard me right! You have to use the intuitive in-game triangulation system to create your map and find your way around an island while being stalked by a creature as you search for a cure to your mysterious ailment
Rain World - 2D Metroidvania where you're a little slugcat in a post-apocalyptic world filled with dangerous predators and lethal rainstorms
Diaries of a Spaceport Janitor - Life sim where you're a janitor in a bustling Star Wars-esque spaceport living on the edge of poverty and dreaming of more
One Shot - Emotional story-driven game in a similar vein of Undertale
Night in the Woods - Not that hidden, but I absolutely love this one. Narrative life sim about someone returning from college to their Appalachian hometown and mysterious things are going on
Dreamfall Chapters - Adventure game that spans a sci-fi dystopia and fantasy world with many interconnections
Grow Home - 3D platformer where you're a little robot growing giant beanstalks to return to your spaceship
There Came An Echo - Tactical strategy shooter you control only with your voice