That's an interesting find with grapple points on the spiders. Obviously it's not game-breaking so no need for an instant fix. I'll look into it next week.
I like the cute Replicon sounds. Spiders are cute!
Seriously though, I'll try giving wasps a slightly scarier sound, and then I'll make each new enemy type sound more menacing as they are added in the future. I think it makes sense to make the more dangerous enemies sound more scary. Did you notice that the Replicon drop ships have much deeper, scarier sounds especially when they first appear?