I think it's a great idea which also opens many possibilities if this game is getting bigger in the future. I think the theme is fully there and well implemented. Graphs & audio are nice. For me it took a while until I knew I didn't have to erase everything that was suggested :D.
I don't know if I got the whole idea but trying to help people (the one in the river by erasing the river or the one with headache by bringing him some medicine), I thought I did it properly but eventually I didn't see any people helped in the menu. Maybe small bug or something I missed.
Finally, impressive coordination work I can imagine for 5 people in just 7 days.