These are what we call the 'YMMV items.' Things that some people find in this work. We call them 'your mileage might vary' because not everyone sees these things in the same way. This starts discussions in the trope lists, a thing we don't want. Please use the discussion page if you'd like to discuss any of these items.
Awesome Music: Didn't really kick in until The Traitor Soul and, to a much lesser extent, The Cursed King. The music in both games consisted of loops lasting under one minute composed by SomaTone Interactive, the same group of people who composed music for games produced by big-time developers such as Ubisoft, Electronic Arts and Blizzard Entertainment.
Demonic Spiders: The Widow Queen, its Widowlings and the Vile Tarantula. With a small group of Widowlings following it around, the Widow Queen will employ Zerg Rush if it sees you. The Vile Tarantula is not only relatively difficult to kill, but can also ensnare you with its Web Spell for a short time, effectively preventing you from fleeing and allowing other monsters nearby to beat you up. Consistent across all three is a scratch attack that often causes poison for nearly two minutes.
There are also the Spindly Creepers and Chittering Horrors. Like the two mentioned above, they can poison you (The Chittering Horror for over three minutes, I think), and their poison will drain your health extremely quickly. On top of that, they can web you too. Have fun.