Would love to see this being added. There's 12 total runs available, 9 of those would end up being different. 'No Healing' is pretty much a duplicated ('Haiku') category in all three rushes and in my opinion doesn't deserve to be listed. 'Haiku', 'Underpowered' and 'Corrupt' all end up being different from each other and varies quite a bit in difficulty.

Rule suggestions: Timer starts when you press Up to enter the Boss Rush, timer stops when the autosplitter recognizes a room-transition after the final boss has been defeated.

I currently have runs ready to be submitted for all three rushes in 'Haiku' mode.