Awesome presentation. The neon esthetic is surprising and attractive, and there are some excellent little touches, such as the fluidity of the player character's animation (even though it's just a rectilinear shape!). Music is catchy but unobtrusive. Puzzles are clever, and there's a good variety of hazards/enemies. Very nice and useful map.
Some suggestions: I wasn't crazy about the control scheme. I found that using X to jump and C to attack while moving with WASD was not very intuitive, and kept having to look at the keyboard. Also, while the frequent checkpoints were excellent, dying and returning to the very beginning was frustrating.