Amazing work! I managed to finish the game without issue (I see I arrived right in time after a potential game-breaking bugfix :D), though I must say the ending was a bit abrupt after the climax of being run after while in split controls. Actually arriving at a Moon Shrine scene with Ann and triggering a cutscene there might make it nicer - but I see the Git history and it seems the ending was added at the very last minute before the deadline ;)
Otherwise great work on all aspects, the gameplay works well (that split screen effect and ungrouping system are both quite nice and challenging), and the graphics and audio fit very well. I enjoyed the writing a lot, both characters have a lot of personality.
Kudos for a great entry!