So, in my many playthroughs, the ones which have lasted the longest are most frequently ones where I’ve found an island shelter. I find I’ve always grown complacent in hanging around these (for all practical purposes) invincible homesteads. There are downsides, such as vehicles being impractical to build offshore, but the positives of never being attacked and the unlimited food source that is fish and agriculture heavily outweigh that most of the time.
Now, I’ve rarely lasted to late game, so if these already exist please disregard this post, but I think that ravenous “fishmen” who could both live in the water and hunt along the shores would not only provide a healthy challenge to players like myself who corner themselves on remote islands, but also fit with the Lovecraftian aesthetics that CDDA has (The Shadow Over Innsmouth is GOAT).
Not only this, but I could finally get PTSD over listening to Ocean Man!
A drawback I can see would be making things like the Island Prison Break scenario much more difficult should these monsters be implemented in early-game, but they could evolve from some blobbed frogs or whatever later in the game.
In conclusion, https://www.youtube.com/watch?v=3tTHn2tHhcI