Oh, and are there really 20 scenes currently? So far, I've only unlocked 11, and I'm a big completionist when it comes to Itch.io games
Hello akopack,
The Sewer only has Egg Flies currently. I think it only had Egg Flies and Slugs in the original as well, but I’ll eventually add some other loot there.
The Egg Flies drop Fly Wings with 40% chance, when defeated.
And yes, there are 20 scenes :). All are unlockable except 1, the Wharf Roach Game Over scene. That one needs more drastic tweaks to be obtainable since it ends in a game over and requires the game to be loaded.
Some scenes require more specific triggers, I think I have one or two answers with the scenes list on the posts below.