This game is pretty underrated! Such an ingeniuous twist and marvelous level design! I think that there are 2 reasons why people didnt play the game as much.
1. Better indication of what to do(People may have thought only one person needed to go to the end)
2.Most people dont have 7zip (reccomend just zipping it) i do but a lot of people wont download 7zip just to play the game.
3. The tutorial text can easily be missed if someone goes through its hitboxes too fast.
Just some constructive critiscm!