Nice entry, I played it blind and must say the mental mapping is really hard when you have no sense of how much you moved.
Or you have to slow down your play a lot to make sure you dont make two moves with one input, adding a stepping sound could help with that.
Also, as stated by others, the game is really punishing, maybe adding a sound to know when you are close to kill cell or just returning to the start of the level instead of start of game could help.
Other than that, nice game, I replayed it with eyes open to see the level design, the long 1 cell runways are a good idea, I got lost at was happening there!