Chalk Gardens is a cute and imaginative exploration game about dealing with life's setbacks. You play as a child exploring dangerously high rooftops while looking for a way to fix your doll. It was made as a graduation project and I think it's pretty short (between 10 min and 30 min depending on the person). I don't know if it qualifies as quirky, but it's definitively full of imagination.
Here is the link: https://red-owl-games.itch.io/chalk-gardens