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.
YMMV: A Valley Without Wind
Awesome Music: Just like with AI War Fleet Command, A Valley Without Wind contains a beautiful, melancholic soundtrack by the formidable Pablo Vega. The sequel even contains a vocal theme that, if it doesn't put tears in your eyes, will be close to it, guaranteed.
Demonic Spiders: Sea Worms. They're huge (bigger than some minibosses), move freely through the air, are fairly fast even after your attacks cut their speed, have a huge HP pool with no elemental weaknesses, and are immune to knockback. Their only attack is to touch you, but when they do, it does a non-trivial amount of damage. One of these on unfortunate terrain can wreck your day, a group makes combat even on flat ground just miserable. And this fearsome, Implacable Creature of the sidescrolling world isn't rare, either - in fact they're a common spawn, up to half a dozen or so on any ocean-themed chunk. Good luck.