Theoretically yes but it will need items like teleport tabs, enchanted jewelry which isn't really worth it on an iron man; there is an iron man mode (press F5 while the GUI is open, title will change to Stealth Quester (ironman mode)) but this only supports 9 quests atm where it will automatically gather all required items; there is also the debug mode (press F4 while the GUI is open) which disables banking and GE, but that requires starting with items in inventory and may not work if some items are missing
Downstairs, upstairs or middle floor? Did it obtain slime/ground bones/tokens?
It may take a little longer, especially when walking, there are some delays which come from the webwalker but shouldn't be an issue; are there any messages spammed in the logger while it is not doing anything?