I like how it works in concept, but I would love to see a little more polish and even some animation put into it.
Spiders should grow from a spider egg- advance in stages from small to large egg, and finally a hatched spider. I’d also appreciate (I’d absolutely hate it- in a good way!) a little squirming animation on the eggs and an idle animation on the spider itself. Maybe cleaning its face and mandibles occasionally… yuck!
Similar systems for other decorative creatures like birds or lizards or insects. Each could have some thematic flair that makes them better fit the boundless universe.
Also, I’d love if they were just a bit more alien. The spiders feel too terran, earthly to me.