Very fun, I really like the different mechanics introduced for the puzzles (ex. g. areas where only one of them can move), the puzzles aren't mindbogglingly difficult but they're still very cool
There was one puzzle where I'm not sure if my solution is the intended one, because I basically moved over a lever that shut the Nul off from getting to the blue flag, but Nul never had to try moving into the raised walls? But overall, very smooth experience, I enjoyed it