Minor bugs I found
- One time when I died in the Deep Dark, my spawnpoint was set to the Venation Village (I used that place as a sort of 'base' since its waypoint was close to both a shop and spawnpoint for healing), and when I respawned there the Deep Dark music kept playing.
- When I got the Blazed Charm and Fire Aspect got applied to all my weapons, my Amethyst Sword reverted to its default attributes (7 attack damage as it was internally a diamond sword) instead of keeping +8 attack damage. My Steel Scythe got the enchantment properly though.
- One time I bought two random charms in a row, the second being bought while the first was still rolling, and the second just disappeared without doing anything.
- The wither skeletons and piglins sometimes started fighting each other in the King's Den. Though this is part of their regular AI and there isn't any way of stopping them from attacking each other.

General feedback / suggestions
- I couldn't figure out what pure essence was for.
- It also wasn't obvious what Magic Milk was meant to do. In Minecraft it cures all effects and I thought that was all it would do, but because it was so pricey in the shop I never bought any. It was after finishing the map that I went into creative and found out it restores health to max.
- It would be pretty cool if the charms in your inventory listed what they did in their lore.

Deeper thoughts on each area:

Abandoned Mines
A good starting area.

Venation Village
This area was probably one of the most difficult for me, being quite a spike in difficulty compared to the Abandoned Mines and the two areas that come after. There were cave spiders, witches, and creepers, the first two being dangerous due to poison, and creepers are inherently dangerous for obvious reasons.

I probably had the most amount of deaths in here, which was annoying since I hadn't yet gotten enough crowns to get a Soul Shovel. Maybe if a level with these difficult enemies had been a bit later in the map when players were more likely to have the Soul Shovel so that deaths to poison and creepers wouldn't be as frustrating. (Especially since some later levels such as the Hive barely had any difficult enemies at all).

Crystal Caverns
Definitely one of my personal favourite levels both in terms of its aesthetic but also in the level design, where It started from the top and I found I could either choose to play it safe and go around the ledges in a spiral downwards, or drop down to try to reach certain areas faster but risk being swarmed by mobs with no way to safely get out. The bridges were also nice.

I will say that this area was way easier to finish than the Venation Village since none of the mobs were anywhere near as annoying, mostly being melee mobs with a few shulkers.

Aquatic Hollows
Another area that I really liked the unique aesthetic of, especially in the large cavern that you first enter into. The glowing water (yay 1.17 light blocks) looked really nice as well. Maybe some of the side caves could have had a bit more done to them to make them stand out, though on the other hand they did highlight the transition to deepslate (i.e. getting deeper and deeper) very well.

Deep Dark
First thing I'll point out is that I did not play with Optifine - I never use it, and I think that without dynamic lighting this level is almost unbeatable simply due to how dark the floor is. Thankfully I found the way to the Hive level pretty quickly, which did surprise me because it wasn't behind a key door. It wasn't until I went back in spectator mode that I found out it was possible to get to the Charred Chambers by completing either Deep Dark or the Hive, which is definitely nice for those who don't want to go all the way through the Deep Dark.

The Hive
Compared to the Deep Dark, the Hive was a piece of cake. The only enemies in here were simple melee mobs (there weren't even any true bees, which can actually be used as enemies with some command magic to make them permanently angry and keep having their stinger given back after stinging). There's not really much else I can think of saying aside from it being a bit too easy for this late in the map.

Charred Chambers
This level felt like a true final journey leading up to the final area. It was lengthy, had lots of branching paths, and plenty of dangerous mobs. Solid area overall.

King's Den
The mobs felt like an extension of Charred Chambers with a few additions, which I'd say worked since this area wasn't hugely long before the boss. Some of the interior aesthetic felt a little too bland, square and flat compared to how varied the rest of the map is.

As for the boss itself, I'd say it was good. It fit the style of the rest of the map. The only real problem was that the checkpoint was easily accessible next to it, and that meant it was way too easy to cheese the boss by regenerating your health. Maybe if checkpoints either stopped regenerating or only regenerated by a little bit during the boss it would be a bit less cheesy.

I also think that the carpet on the floor in the boss arena looks like a pizza. Now that is cheesy.

Apologies for that pun