Really great idea, I would play a full version of this!
In Level 6 it says "All Numbers must add up 9" which confused me for a moment if "add up to 9" was really what was meant.
As mentioned below, I also don't think you needed the platformer passage to stay entertaining. I would have played a few more levels with the normal rules.
Overall great idea and really fits the theme. I really liked the Story cutscene! :)