I was thinking about more ideas to decide how hard a level is.
The first one being comparing similar unfinished levels between the top 20 on the glory board.
You can take the Average death per person finished to determine the difficulty.
You can take the amount of MITSU entering in the area divided by how many PLAYERS have finished it.
And deaths that fall into a space of 3by3 blocks divided by PLAYERS finishing the area.
Lastly the average amount of time spent per PLAYER in the area.
I think the rewards should be adjusted based on the outcome of these calculations~