Solve puzzles by removing dimensions, flattening yourself into a 2D cross-section (or even 1D line!) of the 3D world. There is no trickery here: you will exist in a single slice world, Flatland-style (less Fez or Neko Ghost, Jump!, more Miegakure). This will allow you to interact with the world in ways you might not have thought possible. Squeeze through the narrowest gaps, climb the steepest cliffs, and traverse the widest chasms. Playing as a little blue sphere has never been so mind-bending!
Each level introduces types or configurations of obstacles that you must work through way around (or through) to collect the object that beckons your through the space. Getting past these obstacles isn't so much of a matter of speed or precision, though. They will instead test your understanding of this dimension changing ability, your spatial reasoning, and your powers of observation. You must think in 3D when you are 2D, and in 3D when you are 2D. Somewhere along the way you'll have to get comfortable with 1D as well. It will take more than a little brain-power to discover how these modes interact with slopes, blocks, fans, corkscrews, and more.
Occasionally, you will find "Comment Blocks" (some obvious, some hidden) which contain the philosophical writings of a woman, dumped haphazardly throughout the source code of a device she is building. A device that she is determined to complete, and that, unexpectedly (and unbeknownst to her), created the world your character inhabits. The more Comment Blocks you find, the more you learn about her past, her dedication to completing this project, and the details of the project itself. You will undoubtedly have questions, will you find all the answers?