I guess something to start with on HoD is something to complain about. Now, I love the game still, and I enjoyed playing through it again, but I observed something about it and I really want to talk about it.

Money and loot drops.
The number one way to make money in HoD is to find one of the candles which drops big bags of money next to a doorway, so that you can go in and out of there, grinding that same candle to make money. Early on you can find one which is $100, later on you'll find one with is $250, and eventually you'll find one which is $400, and I don't just mean these values dropping sometimes from monsters, I really do mean that they drop from a candle right by a doorway so that you can go back and forth to stack coins.

You can also find gems, and you can sell those, just like in SoTN, but these are SO rare to find. There's one or two lying around which you can find, and then past that you just have the chance that maybe a monster will drop one.
This happens VERY rarely, relatively few monsters drop gems, and gems are really not that valuable either, the most priced one is the diamond, which is worth $1000, and which I got like, once, after killing the "Pixies" a bunch of times. You can make that money in the fraction of that time just grinding one of the 'moneycandles' instead, so there's not exactly a good incentive to grind for gems, they're basically just there because they were also in SoTN.

Do you really need money in HoD? Eh, not particularly, you could find enough lying around that you could buy some potions to have in reserve for bossfights, and you'd find equipment lying around which is generally useful. Would the game be harder without potions?
Sure, but it does the same thing as CoTM where save points restore HP & MP, which you can rely on just the same (and need to, because healing potions are not very useful in CoTM), and you'd get by anyway.

It's one of those aspects where HoD was maybe a bit underbaked.