Pagefault is a puzzle platformer, by tehpilot, built during the GMC Jam 33. You've lost some files, and you need to spelunk through the inner depths of your computer to find it again.
This game takes place in a windows-inspired "desktop simulator," and you open and interact with different programs to play the game. In chat, you have an administrator who is walking you through locating different files on your system. They're the guiding hand as you platform through the file viewer, where you're actually platforming around, WASD-style.
Later, the admin grants you access to a memory viewer program, which is an exciting twist. It shows the same level you're interacting within the file viewer, but the memory viewer can see things the file viewer can't. You even interact with the world differently—as mouse cursor on rails, traveling through walls and floors. While you're going through the levels, you also find and interact with different binary puzzles, and solve the binary puzzles that unlock doors to advance through the level. (Of course, the game provides an effective Instructions program that can sort your binary conversion troubles out, but it's not that hard to learn!)
Pagefault was a totally unexpected find for me. As with many game jam games with clever mechanics like these, I wanted at least double the levels. I think there's more design space here for the developer to continue to add more content and challenge the player.