This is probably just an experience, not really a game since it doesn't have an ending. Managed to clear everything and it still kept playing. You probably could have gamified this by making the cleaner only clean on certain inputs and added a scavanger hunt. So it could have become sort of like a memory game for children or something.
Example:
- open game. The game shows you 5 - 10 children that are hidding on the map
- they burrow into the snow
- game fades out, then back in to make the player oblivious slightly where they are
- player needs to find them and you track how many tiles the player had to open before finding everyone
Wanted to share the above idea just to get it out of my head :) . Well done on creating this!