basically everything everyone else said. also hopefully this helps you.
Pwp affect citizen satisfaction in two ways they can either increase or decrease nature and livability points. The only really bad one is the garbage can that greatly decreases both and the illuminated heart only slightly decreases nature points. Though you can offset the decreasing points with the ones that do increase them yes.
Public Work Projects that affect Nature Points:
↑↑↑Greatly increase:
Flower Clock
↑↑Largely increase:
Flower Bed, Flower Arch, Wisteria Trellis, Rack of Rice, Circle Topiary, Square Topiary, Tulip Topiary
↑Slightly increase:
Solar Panel, Wind Turbine, Windmill
↓Slightly decrease:
Picnic Blanket, Traffic Signal, lluminated Heart, Illuminated Arch, Illuminated Clock, Illuminated Tree, Tower
↓↓Largely decrease:
Tire Toy
↓↓↓Greatly decrease:
Garbage Can, Video Screen, Drilling Rig
The only pwp that decreases livability is the garbage can and most increase it especially the campsite, police station, and cafe.