2D puzzle-platformer A Pixel Story is an interesting game. It’s incredibly meta, and has a hat that evokes Portal-like gameplay mechanics, but tells a story about video games themselves. As you progress, the visuals improve as you are traveling through generations and, look, it’s all a bit strange and is easier to explain by showing you what it looks like.
It’s available now on Steam, and although I’m not here to say it’s the second coming, it’s a fun platformer with some interesting elements, and it’s under £10.