Really needs an explanation somewhere of what the stats do and how the dungeons work.
Casino is too overpowered compared to dungeon income. Would you like to wait 10 seconds for 1-2 gold or gain 3 gold every second for the cost of 5 gold? It scales pretty well too.
Would be good to have +5/+10 buttons for dungeon stat assignment.
Clearing a dungeon takes at least 20 minutes of idling even with the maxed out buildings, and the game does not progress when tabbed out, so you are forced to keep the tab open and in focus for a third of an hour before you can reset for Favour. Consider making early dungeons shorter than 100 floors?
Looking at the code, the stored Favour actually makes the dungeon clearing speed slower, not faster (the effect is pretty minor, though, just (favor+1)^0.1). Consider vastly increasing it and making it actually decrease the dungeon waiting time? The first few Favour upgrades are pretty much useless and you only gain a few Favour per reset (because the gain formula is money to the power of 0.05, and early dungeons only give 1 Favour gain on completion - this is also not displayed in the Favour gain text); would be good if they at least cut the time between resets in half.
Oh, and the Favour reset does not even work because you wrote dungeonPower instead of getDungeonPower().
UPD: the game was updated, and some of those points are resolved now.