I just wanted to add that I also think that a 3/10 difficulty rating is definitely too low. When I see a 3/10, I think it should be a game that I can complete with little to no effort, and that is simply not the case with this game. It is by no means super difficult, but I think a 5/10 or 6/10 would be more appropriate. There are several levels that require multiple precise jumps and ducks that need to be executed perfectly or else you need to restart.
Also, 6-8 hours seems too low. Perhaps a little closer to 12 hours would be more accurate for me.