Are Shop items, in particular the Fist Pack, allowed on IL runs? They are an intended mechanic of the game, and they allow you to complete levels like Twilight Gulch more efficiently, but by allowing them it may cause IL attempts to become more tedious. You would either have to grind Tings to be able to afford to make repeated attempts, or turn off Autosave and reload your save file every time you fail an attempt. I'd personally support banning it on those grounds.